diff --git a/config/dbscheme-fragments.json b/config/dbscheme-fragments.json
index c56289ff171..b8c79fc8f3a 100644
--- a/config/dbscheme-fragments.json
+++ b/config/dbscheme-fragments.json
@@ -11,6 +11,7 @@
     "/*- Diagnostic messages -*/",
     "/*- Diagnostic messages: severity -*/",
     "/*- Source location prefix -*/",
+    "/*- Database metadata -*/",
     "/*- Lines of code -*/",
     "/*- Configuration files with key value pairs -*/",
     "/*- YAML -*/",
@@ -31,4 +32,4 @@
     "/*- Python dbscheme -*/",
     "/*- Empty location -*/"
   ]
-}
\ No newline at end of file
+}
diff --git a/ql/extractor/src/generator.rs b/ql/extractor/src/generator.rs
index 1dca6969f34..ea663896e64 100644
--- a/ql/extractor/src/generator.rs
+++ b/ql/extractor/src/generator.rs
@@ -36,5 +36,5 @@ pub fn run(options: Options) -> std::io::Result<()> {
         },
     ];
 
-    generate(languages, options.dbscheme, options.library)
+    generate(languages, options.dbscheme, options.library, false)
 }
diff --git a/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/old.dbscheme b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/old.dbscheme
new file mode 100644
index 00000000000..dc51d416301
--- /dev/null
+++ b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/old.dbscheme
@@ -0,0 +1,1532 @@
+// CodeQL database schema for Ruby
+// Automatically generated from the tree-sitter grammar; do not edit
+
+/*- Files and folders -*/
+
+/**
+ * The location of an element.
+ * The location spans column `startcolumn` of line `startline` to
+ * column `endcolumn` of line `endline` in file `file`.
+ * For more information, see
+ * [Locations](https://codeql.github.com/docs/writing-codeql-queries/providing-locations-in-codeql-queries/).
+ */
+locations_default(
+  unique int id: @location_default,
+  int file: @file ref,
+  int beginLine: int ref,
+  int beginColumn: int ref,
+  int endLine: int ref,
+  int endColumn: int ref
+);
+
+files(
+  unique int id: @file,
+  string name: string ref
+);
+
+folders(
+  unique int id: @folder,
+  string name: string ref
+);
+
+@container = @file | @folder
+
+containerparent(
+  int parent: @container ref,
+  unique int child: @container ref
+);
+
+/*- Empty location -*/
+
+empty_location(
+  int location: @location_default ref
+);
+
+/*- Source location prefix -*/
+
+/**
+ * The source location of the snapshot.
+ */
+sourceLocationPrefix(string prefix : string ref);
+
+/*- Diagnostic messages -*/
+
+diagnostics(
+  unique int id: @diagnostic,
+  int severity: int ref,
+  string error_tag: string ref,
+  string error_message: string ref,
+  string full_error_message: string ref,
+  int location: @location_default ref
+);
+
+/*- Diagnostic messages: severity -*/
+
+case @diagnostic.severity of
+  10 = @diagnostic_debug
+| 20 = @diagnostic_info
+| 30 = @diagnostic_warning
+| 40 = @diagnostic_error
+;
+
+/*- YAML -*/
+
+#keyset[parent, idx]
+yaml (unique int id: @yaml_node,
+      int kind: int ref,
+      int parent: @yaml_node_parent ref,
+      int idx: int ref,
+      string tag: string ref,
+      string tostring: string ref);
+
+case @yaml_node.kind of
+  0 = @yaml_scalar_node
+| 1 = @yaml_mapping_node
+| 2 = @yaml_sequence_node
+| 3 = @yaml_alias_node
+;
+
+@yaml_collection_node = @yaml_mapping_node | @yaml_sequence_node;
+
+@yaml_node_parent = @yaml_collection_node | @file;
+
+yaml_anchors (unique int node: @yaml_node ref,
+              string anchor: string ref);
+
+yaml_aliases (unique int alias: @yaml_alias_node ref,
+              string target: string ref);
+
+yaml_scalars (unique int scalar: @yaml_scalar_node ref,
+              int style: int ref,
+              string value: string ref);
+
+yaml_errors (unique int id: @yaml_error,
+             string message: string ref);
+
+yaml_locations(unique int locatable: @yaml_locatable ref,
+             int location: @location_default ref);
+
+@yaml_locatable = @yaml_node | @yaml_error;
+
+/*- Database metadata -*/
+databaseMetadata(
+  string metadataKey: string ref,
+  string value: string ref
+);
+
+/*- Ruby dbscheme -*/
+@ruby_underscore_arg = @ruby_assignment | @ruby_binary | @ruby_conditional | @ruby_operator_assignment | @ruby_range | @ruby_unary | @ruby_underscore_primary
+
+@ruby_underscore_call_operator = @ruby_reserved_word
+
+@ruby_underscore_expression = @ruby_assignment | @ruby_binary | @ruby_break | @ruby_call | @ruby_match_pattern | @ruby_next | @ruby_operator_assignment | @ruby_return | @ruby_test_pattern | @ruby_unary | @ruby_underscore_arg | @ruby_yield
+
+@ruby_underscore_lhs = @ruby_call | @ruby_element_reference | @ruby_scope_resolution | @ruby_token_false | @ruby_token_nil | @ruby_token_true | @ruby_underscore_variable
+
+@ruby_underscore_method_name = @ruby_delimited_symbol | @ruby_setter | @ruby_token_constant | @ruby_token_identifier | @ruby_token_operator | @ruby_token_simple_symbol | @ruby_underscore_nonlocal_variable
+
+@ruby_underscore_nonlocal_variable = @ruby_token_class_variable | @ruby_token_global_variable | @ruby_token_instance_variable
+
+@ruby_underscore_pattern_constant = @ruby_scope_resolution | @ruby_token_constant
+
+@ruby_underscore_pattern_expr = @ruby_alternative_pattern | @ruby_as_pattern | @ruby_underscore_pattern_expr_basic
+
+@ruby_underscore_pattern_expr_basic = @ruby_array_pattern | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_parenthesized_pattern | @ruby_range | @ruby_token_identifier | @ruby_underscore_pattern_constant | @ruby_underscore_pattern_primitive | @ruby_variable_reference_pattern
+
+@ruby_underscore_pattern_primitive = @ruby_delimited_symbol | @ruby_lambda | @ruby_regex | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_encoding | @ruby_token_false | @ruby_token_file | @ruby_token_heredoc_beginning | @ruby_token_line | @ruby_token_nil | @ruby_token_self | @ruby_token_simple_symbol | @ruby_token_true | @ruby_unary | @ruby_underscore_simple_numeric
+
+@ruby_underscore_pattern_top_expr_body = @ruby_array_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_underscore_pattern_expr
+
+@ruby_underscore_primary = @ruby_array | @ruby_begin | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_delimited_symbol | @ruby_for | @ruby_hash | @ruby_if | @ruby_lambda | @ruby_method | @ruby_module | @ruby_next | @ruby_parenthesized_statements | @ruby_redo | @ruby_regex | @ruby_retry | @ruby_return | @ruby_singleton_class | @ruby_singleton_method | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_character | @ruby_token_heredoc_beginning | @ruby_token_simple_symbol | @ruby_unary | @ruby_underscore_lhs | @ruby_underscore_simple_numeric | @ruby_unless | @ruby_until | @ruby_while | @ruby_yield
+
+@ruby_underscore_simple_numeric = @ruby_complex | @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+@ruby_underscore_statement = @ruby_alias | @ruby_begin_block | @ruby_end_block | @ruby_if_modifier | @ruby_rescue_modifier | @ruby_undef | @ruby_underscore_expression | @ruby_unless_modifier | @ruby_until_modifier | @ruby_while_modifier
+
+@ruby_underscore_variable = @ruby_token_constant | @ruby_token_identifier | @ruby_token_self | @ruby_token_super | @ruby_underscore_nonlocal_variable
+
+ruby_alias_def(
+  unique int id: @ruby_alias,
+  int alias: @ruby_underscore_method_name ref,
+  int name: @ruby_underscore_method_name ref
+);
+
+#keyset[ruby_alternative_pattern, index]
+ruby_alternative_pattern_alternatives(
+  int ruby_alternative_pattern: @ruby_alternative_pattern ref,
+  int index: int ref,
+  unique int alternatives: @ruby_underscore_pattern_expr_basic ref
+);
+
+ruby_alternative_pattern_def(
+  unique int id: @ruby_alternative_pattern
+);
+
+@ruby_argument_list_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_argument_list, index]
+ruby_argument_list_child(
+  int ruby_argument_list: @ruby_argument_list ref,
+  int index: int ref,
+  unique int child: @ruby_argument_list_child_type ref
+);
+
+ruby_argument_list_def(
+  unique int id: @ruby_argument_list
+);
+
+@ruby_array_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_array, index]
+ruby_array_child(
+  int ruby_array: @ruby_array ref,
+  int index: int ref,
+  unique int child: @ruby_array_child_type ref
+);
+
+ruby_array_def(
+  unique int id: @ruby_array
+);
+
+ruby_array_pattern_class(
+  unique int ruby_array_pattern: @ruby_array_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_array_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_array_pattern, index]
+ruby_array_pattern_child(
+  int ruby_array_pattern: @ruby_array_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_array_pattern_child_type ref
+);
+
+ruby_array_pattern_def(
+  unique int id: @ruby_array_pattern
+);
+
+ruby_as_pattern_def(
+  unique int id: @ruby_as_pattern,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_assignment_left_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+@ruby_assignment_right_type = @ruby_rescue_modifier | @ruby_right_assignment_list | @ruby_splat_argument | @ruby_underscore_expression
+
+ruby_assignment_def(
+  unique int id: @ruby_assignment,
+  int left: @ruby_assignment_left_type ref,
+  int right: @ruby_assignment_right_type ref
+);
+
+@ruby_bare_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_string, index]
+ruby_bare_string_child(
+  int ruby_bare_string: @ruby_bare_string ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string_child_type ref
+);
+
+ruby_bare_string_def(
+  unique int id: @ruby_bare_string
+);
+
+@ruby_bare_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_symbol, index]
+ruby_bare_symbol_child(
+  int ruby_bare_symbol: @ruby_bare_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol_child_type ref
+);
+
+ruby_bare_symbol_def(
+  unique int id: @ruby_bare_symbol
+);
+
+@ruby_begin_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin, index]
+ruby_begin_child(
+  int ruby_begin: @ruby_begin ref,
+  int index: int ref,
+  unique int child: @ruby_begin_child_type ref
+);
+
+ruby_begin_def(
+  unique int id: @ruby_begin
+);
+
+@ruby_begin_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin_block, index]
+ruby_begin_block_child(
+  int ruby_begin_block: @ruby_begin_block ref,
+  int index: int ref,
+  unique int child: @ruby_begin_block_child_type ref
+);
+
+ruby_begin_block_def(
+  unique int id: @ruby_begin_block
+);
+
+@ruby_binary_left_type = @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_binary.operator of
+  0 = @ruby_binary_bangequal
+| 1 = @ruby_binary_bangtilde
+| 2 = @ruby_binary_percent
+| 3 = @ruby_binary_ampersand
+| 4 = @ruby_binary_ampersandampersand
+| 5 = @ruby_binary_star
+| 6 = @ruby_binary_starstar
+| 7 = @ruby_binary_plus
+| 8 = @ruby_binary_minus
+| 9 = @ruby_binary_slash
+| 10 = @ruby_binary_langle
+| 11 = @ruby_binary_langlelangle
+| 12 = @ruby_binary_langleequal
+| 13 = @ruby_binary_langleequalrangle
+| 14 = @ruby_binary_equalequal
+| 15 = @ruby_binary_equalequalequal
+| 16 = @ruby_binary_equaltilde
+| 17 = @ruby_binary_rangle
+| 18 = @ruby_binary_rangleequal
+| 19 = @ruby_binary_ranglerangle
+| 20 = @ruby_binary_caret
+| 21 = @ruby_binary_and
+| 22 = @ruby_binary_or
+| 23 = @ruby_binary_pipe
+| 24 = @ruby_binary_pipepipe
+;
+
+
+ruby_binary_def(
+  unique int id: @ruby_binary,
+  int left: @ruby_binary_left_type ref,
+  int operator: int ref,
+  int right: @ruby_underscore_expression ref
+);
+
+ruby_block_body(
+  unique int ruby_block: @ruby_block ref,
+  unique int body: @ruby_block_body ref
+);
+
+ruby_block_parameters(
+  unique int ruby_block: @ruby_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_block_def(
+  unique int id: @ruby_block
+);
+
+ruby_block_argument_child(
+  unique int ruby_block_argument: @ruby_block_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_block_argument_def(
+  unique int id: @ruby_block_argument
+);
+
+@ruby_block_body_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_block_body, index]
+ruby_block_body_child(
+  int ruby_block_body: @ruby_block_body ref,
+  int index: int ref,
+  unique int child: @ruby_block_body_child_type ref
+);
+
+ruby_block_body_def(
+  unique int id: @ruby_block_body
+);
+
+ruby_block_parameter_name(
+  unique int ruby_block_parameter: @ruby_block_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_block_parameter_def(
+  unique int id: @ruby_block_parameter
+);
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_locals(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int locals: @ruby_token_identifier ref
+);
+
+@ruby_block_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_child(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_block_parameters_child_type ref
+);
+
+ruby_block_parameters_def(
+  unique int id: @ruby_block_parameters
+);
+
+@ruby_body_statement_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_body_statement, index]
+ruby_body_statement_child(
+  int ruby_body_statement: @ruby_body_statement ref,
+  int index: int ref,
+  unique int child: @ruby_body_statement_child_type ref
+);
+
+ruby_body_statement_def(
+  unique int id: @ruby_body_statement
+);
+
+ruby_break_child(
+  unique int ruby_break: @ruby_break ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_break_def(
+  unique int id: @ruby_break
+);
+
+ruby_call_arguments(
+  unique int ruby_call: @ruby_call ref,
+  unique int arguments: @ruby_argument_list ref
+);
+
+@ruby_call_block_type = @ruby_block | @ruby_do_block
+
+ruby_call_block(
+  unique int ruby_call: @ruby_call ref,
+  unique int block: @ruby_call_block_type ref
+);
+
+@ruby_call_method_type = @ruby_token_operator | @ruby_underscore_variable
+
+ruby_call_method(
+  unique int ruby_call: @ruby_call ref,
+  unique int method: @ruby_call_method_type ref
+);
+
+ruby_call_operator(
+  unique int ruby_call: @ruby_call ref,
+  unique int operator: @ruby_underscore_call_operator ref
+);
+
+ruby_call_receiver(
+  unique int ruby_call: @ruby_call ref,
+  unique int receiver: @ruby_underscore_primary ref
+);
+
+ruby_call_def(
+  unique int id: @ruby_call
+);
+
+ruby_case_value(
+  unique int ruby_case__: @ruby_case__ ref,
+  unique int value: @ruby_underscore_statement ref
+);
+
+@ruby_case_child_type = @ruby_else | @ruby_when
+
+#keyset[ruby_case__, index]
+ruby_case_child(
+  int ruby_case__: @ruby_case__ ref,
+  int index: int ref,
+  unique int child: @ruby_case_child_type ref
+);
+
+ruby_case_def(
+  unique int id: @ruby_case__
+);
+
+#keyset[ruby_case_match, index]
+ruby_case_match_clauses(
+  int ruby_case_match: @ruby_case_match ref,
+  int index: int ref,
+  unique int clauses: @ruby_in_clause ref
+);
+
+ruby_case_match_else(
+  unique int ruby_case_match: @ruby_case_match ref,
+  unique int else: @ruby_else ref
+);
+
+ruby_case_match_def(
+  unique int id: @ruby_case_match,
+  int value: @ruby_underscore_statement ref
+);
+
+#keyset[ruby_chained_string, index]
+ruby_chained_string_child(
+  int ruby_chained_string: @ruby_chained_string ref,
+  int index: int ref,
+  unique int child: @ruby_string__ ref
+);
+
+ruby_chained_string_def(
+  unique int id: @ruby_chained_string
+);
+
+ruby_class_body(
+  unique int ruby_class: @ruby_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_class_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_class_superclass(
+  unique int ruby_class: @ruby_class ref,
+  unique int superclass: @ruby_superclass ref
+);
+
+ruby_class_def(
+  unique int id: @ruby_class,
+  int name: @ruby_class_name_type ref
+);
+
+@ruby_complex_child_type = @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+ruby_complex_def(
+  unique int id: @ruby_complex,
+  int child: @ruby_complex_child_type ref
+);
+
+ruby_conditional_def(
+  unique int id: @ruby_conditional,
+  int alternative: @ruby_underscore_arg ref,
+  int condition: @ruby_underscore_arg ref,
+  int consequence: @ruby_underscore_arg ref
+);
+
+@ruby_delimited_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_delimited_symbol, index]
+ruby_delimited_symbol_child(
+  int ruby_delimited_symbol: @ruby_delimited_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_delimited_symbol_child_type ref
+);
+
+ruby_delimited_symbol_def(
+  unique int id: @ruby_delimited_symbol
+);
+
+@ruby_destructured_left_assignment_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_destructured_left_assignment, index]
+ruby_destructured_left_assignment_child(
+  int ruby_destructured_left_assignment: @ruby_destructured_left_assignment ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_left_assignment_child_type ref
+);
+
+ruby_destructured_left_assignment_def(
+  unique int id: @ruby_destructured_left_assignment
+);
+
+@ruby_destructured_parameter_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_destructured_parameter, index]
+ruby_destructured_parameter_child(
+  int ruby_destructured_parameter: @ruby_destructured_parameter ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_parameter_child_type ref
+);
+
+ruby_destructured_parameter_def(
+  unique int id: @ruby_destructured_parameter
+);
+
+@ruby_do_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_do, index]
+ruby_do_child(
+  int ruby_do: @ruby_do ref,
+  int index: int ref,
+  unique int child: @ruby_do_child_type ref
+);
+
+ruby_do_def(
+  unique int id: @ruby_do
+);
+
+ruby_do_block_body(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_do_block_parameters(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_do_block_def(
+  unique int id: @ruby_do_block
+);
+
+@ruby_element_reference_block_type = @ruby_block | @ruby_do_block
+
+ruby_element_reference_block(
+  unique int ruby_element_reference: @ruby_element_reference ref,
+  unique int block: @ruby_element_reference_block_type ref
+);
+
+@ruby_element_reference_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_element_reference, index]
+ruby_element_reference_child(
+  int ruby_element_reference: @ruby_element_reference ref,
+  int index: int ref,
+  unique int child: @ruby_element_reference_child_type ref
+);
+
+ruby_element_reference_def(
+  unique int id: @ruby_element_reference,
+  int object: @ruby_underscore_primary ref
+);
+
+@ruby_else_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_else, index]
+ruby_else_child(
+  int ruby_else: @ruby_else ref,
+  int index: int ref,
+  unique int child: @ruby_else_child_type ref
+);
+
+ruby_else_def(
+  unique int id: @ruby_else
+);
+
+@ruby_elsif_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_elsif_alternative(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int alternative: @ruby_elsif_alternative_type ref
+);
+
+ruby_elsif_consequence(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_elsif_def(
+  unique int id: @ruby_elsif,
+  int condition: @ruby_underscore_statement ref
+);
+
+@ruby_end_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_end_block, index]
+ruby_end_block_child(
+  int ruby_end_block: @ruby_end_block ref,
+  int index: int ref,
+  unique int child: @ruby_end_block_child_type ref
+);
+
+ruby_end_block_def(
+  unique int id: @ruby_end_block
+);
+
+@ruby_ensure_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_ensure, index]
+ruby_ensure_child(
+  int ruby_ensure: @ruby_ensure ref,
+  int index: int ref,
+  unique int child: @ruby_ensure_child_type ref
+);
+
+ruby_ensure_def(
+  unique int id: @ruby_ensure
+);
+
+ruby_exception_variable_def(
+  unique int id: @ruby_exception_variable,
+  int child: @ruby_underscore_lhs ref
+);
+
+@ruby_exceptions_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_exceptions, index]
+ruby_exceptions_child(
+  int ruby_exceptions: @ruby_exceptions ref,
+  int index: int ref,
+  unique int child: @ruby_exceptions_child_type ref
+);
+
+ruby_exceptions_def(
+  unique int id: @ruby_exceptions
+);
+
+ruby_expression_reference_pattern_def(
+  unique int id: @ruby_expression_reference_pattern,
+  int value: @ruby_underscore_expression ref
+);
+
+ruby_find_pattern_class(
+  unique int ruby_find_pattern: @ruby_find_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_find_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_find_pattern, index]
+ruby_find_pattern_child(
+  int ruby_find_pattern: @ruby_find_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_find_pattern_child_type ref
+);
+
+ruby_find_pattern_def(
+  unique int id: @ruby_find_pattern
+);
+
+@ruby_for_pattern_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+ruby_for_def(
+  unique int id: @ruby_for,
+  int body: @ruby_do ref,
+  int pattern: @ruby_for_pattern_type ref,
+  int value: @ruby_in ref
+);
+
+@ruby_hash_child_type = @ruby_hash_splat_argument | @ruby_pair
+
+#keyset[ruby_hash, index]
+ruby_hash_child(
+  int ruby_hash: @ruby_hash ref,
+  int index: int ref,
+  unique int child: @ruby_hash_child_type ref
+);
+
+ruby_hash_def(
+  unique int id: @ruby_hash
+);
+
+ruby_hash_pattern_class(
+  unique int ruby_hash_pattern: @ruby_hash_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_hash_pattern_child_type = @ruby_hash_splat_parameter | @ruby_keyword_pattern | @ruby_token_hash_splat_nil
+
+#keyset[ruby_hash_pattern, index]
+ruby_hash_pattern_child(
+  int ruby_hash_pattern: @ruby_hash_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_hash_pattern_child_type ref
+);
+
+ruby_hash_pattern_def(
+  unique int id: @ruby_hash_pattern
+);
+
+ruby_hash_splat_argument_child(
+  unique int ruby_hash_splat_argument: @ruby_hash_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_hash_splat_argument_def(
+  unique int id: @ruby_hash_splat_argument
+);
+
+ruby_hash_splat_parameter_name(
+  unique int ruby_hash_splat_parameter: @ruby_hash_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_hash_splat_parameter_def(
+  unique int id: @ruby_hash_splat_parameter
+);
+
+@ruby_heredoc_body_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_heredoc_content | @ruby_token_heredoc_end
+
+#keyset[ruby_heredoc_body, index]
+ruby_heredoc_body_child(
+  int ruby_heredoc_body: @ruby_heredoc_body ref,
+  int index: int ref,
+  unique int child: @ruby_heredoc_body_child_type ref
+);
+
+ruby_heredoc_body_def(
+  unique int id: @ruby_heredoc_body
+);
+
+@ruby_if_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_if_alternative(
+  unique int ruby_if: @ruby_if ref,
+  unique int alternative: @ruby_if_alternative_type ref
+);
+
+ruby_if_consequence(
+  unique int ruby_if: @ruby_if ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_if_def(
+  unique int id: @ruby_if,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_if_guard_def(
+  unique int id: @ruby_if_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_if_modifier_def(
+  unique int id: @ruby_if_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_in_def(
+  unique int id: @ruby_in,
+  int child: @ruby_underscore_arg ref
+);
+
+ruby_in_clause_body(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int body: @ruby_then ref
+);
+
+@ruby_in_clause_guard_type = @ruby_if_guard | @ruby_unless_guard
+
+ruby_in_clause_guard(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int guard: @ruby_in_clause_guard_type ref
+);
+
+ruby_in_clause_def(
+  unique int id: @ruby_in_clause,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref
+);
+
+@ruby_interpolation_child_type = @ruby_token_empty_statement | @ruby_underscore_nonlocal_variable | @ruby_underscore_statement
+
+#keyset[ruby_interpolation, index]
+ruby_interpolation_child(
+  int ruby_interpolation: @ruby_interpolation ref,
+  int index: int ref,
+  unique int child: @ruby_interpolation_child_type ref
+);
+
+ruby_interpolation_def(
+  unique int id: @ruby_interpolation
+);
+
+ruby_keyword_parameter_value(
+  unique int ruby_keyword_parameter: @ruby_keyword_parameter ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_keyword_parameter_def(
+  unique int id: @ruby_keyword_parameter,
+  int name: @ruby_token_identifier ref
+);
+
+@ruby_keyword_pattern_key_type = @ruby_string__ | @ruby_token_hash_key_symbol
+
+ruby_keyword_pattern_value(
+  unique int ruby_keyword_pattern: @ruby_keyword_pattern ref,
+  unique int value: @ruby_underscore_pattern_expr ref
+);
+
+ruby_keyword_pattern_def(
+  unique int id: @ruby_keyword_pattern,
+  int key__: @ruby_keyword_pattern_key_type ref
+);
+
+@ruby_lambda_body_type = @ruby_block | @ruby_do_block
+
+ruby_lambda_parameters(
+  unique int ruby_lambda: @ruby_lambda ref,
+  unique int parameters: @ruby_lambda_parameters ref
+);
+
+ruby_lambda_def(
+  unique int id: @ruby_lambda,
+  int body: @ruby_lambda_body_type ref
+);
+
+@ruby_lambda_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_lambda_parameters, index]
+ruby_lambda_parameters_child(
+  int ruby_lambda_parameters: @ruby_lambda_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_lambda_parameters_child_type ref
+);
+
+ruby_lambda_parameters_def(
+  unique int id: @ruby_lambda_parameters
+);
+
+@ruby_left_assignment_list_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_left_assignment_list, index]
+ruby_left_assignment_list_child(
+  int ruby_left_assignment_list: @ruby_left_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_left_assignment_list_child_type ref
+);
+
+ruby_left_assignment_list_def(
+  unique int id: @ruby_left_assignment_list
+);
+
+ruby_match_pattern_def(
+  unique int id: @ruby_match_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_method_body(
+  unique int ruby_method: @ruby_method ref,
+  unique int body: @ruby_method_body_type ref
+);
+
+ruby_method_parameters(
+  unique int ruby_method: @ruby_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_method_def(
+  unique int id: @ruby_method,
+  int name: @ruby_underscore_method_name ref
+);
+
+@ruby_method_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_method_parameters, index]
+ruby_method_parameters_child(
+  int ruby_method_parameters: @ruby_method_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_method_parameters_child_type ref
+);
+
+ruby_method_parameters_def(
+  unique int id: @ruby_method_parameters
+);
+
+ruby_module_body(
+  unique int ruby_module: @ruby_module ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_module_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_module_def(
+  unique int id: @ruby_module,
+  int name: @ruby_module_name_type ref
+);
+
+ruby_next_child(
+  unique int ruby_next: @ruby_next ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_next_def(
+  unique int id: @ruby_next
+);
+
+case @ruby_operator_assignment.operator of
+  0 = @ruby_operator_assignment_percentequal
+| 1 = @ruby_operator_assignment_ampersandampersandequal
+| 2 = @ruby_operator_assignment_ampersandequal
+| 3 = @ruby_operator_assignment_starstarequal
+| 4 = @ruby_operator_assignment_starequal
+| 5 = @ruby_operator_assignment_plusequal
+| 6 = @ruby_operator_assignment_minusequal
+| 7 = @ruby_operator_assignment_slashequal
+| 8 = @ruby_operator_assignment_langlelangleequal
+| 9 = @ruby_operator_assignment_ranglerangleequal
+| 10 = @ruby_operator_assignment_caretequal
+| 11 = @ruby_operator_assignment_pipeequal
+| 12 = @ruby_operator_assignment_pipepipeequal
+;
+
+
+@ruby_operator_assignment_right_type = @ruby_rescue_modifier | @ruby_underscore_expression
+
+ruby_operator_assignment_def(
+  unique int id: @ruby_operator_assignment,
+  int left: @ruby_underscore_lhs ref,
+  int operator: int ref,
+  int right: @ruby_operator_assignment_right_type ref
+);
+
+ruby_optional_parameter_def(
+  unique int id: @ruby_optional_parameter,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_pair_key_type = @ruby_string__ | @ruby_token_hash_key_symbol | @ruby_underscore_arg
+
+ruby_pair_value(
+  unique int ruby_pair: @ruby_pair ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_pair_def(
+  unique int id: @ruby_pair,
+  int key__: @ruby_pair_key_type ref
+);
+
+ruby_parenthesized_pattern_def(
+  unique int id: @ruby_parenthesized_pattern,
+  int child: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_parenthesized_statements_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_parenthesized_statements, index]
+ruby_parenthesized_statements_child(
+  int ruby_parenthesized_statements: @ruby_parenthesized_statements ref,
+  int index: int ref,
+  unique int child: @ruby_parenthesized_statements_child_type ref
+);
+
+ruby_parenthesized_statements_def(
+  unique int id: @ruby_parenthesized_statements
+);
+
+@ruby_pattern_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+ruby_pattern_def(
+  unique int id: @ruby_pattern,
+  int child: @ruby_pattern_child_type ref
+);
+
+@ruby_program_child_type = @ruby_token_empty_statement | @ruby_token_uninterpreted | @ruby_underscore_statement
+
+#keyset[ruby_program, index]
+ruby_program_child(
+  int ruby_program: @ruby_program ref,
+  int index: int ref,
+  unique int child: @ruby_program_child_type ref
+);
+
+ruby_program_def(
+  unique int id: @ruby_program
+);
+
+@ruby_range_begin_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_begin(
+  unique int ruby_range: @ruby_range ref,
+  unique int begin: @ruby_range_begin_type ref
+);
+
+@ruby_range_end_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_end(
+  unique int ruby_range: @ruby_range ref,
+  unique int end: @ruby_range_end_type ref
+);
+
+case @ruby_range.operator of
+  0 = @ruby_range_dotdot
+| 1 = @ruby_range_dotdotdot
+;
+
+
+ruby_range_def(
+  unique int id: @ruby_range,
+  int operator: int ref
+);
+
+@ruby_rational_child_type = @ruby_token_float | @ruby_token_integer
+
+ruby_rational_def(
+  unique int id: @ruby_rational,
+  int child: @ruby_rational_child_type ref
+);
+
+ruby_redo_child(
+  unique int ruby_redo: @ruby_redo ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_redo_def(
+  unique int id: @ruby_redo
+);
+
+@ruby_regex_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_regex, index]
+ruby_regex_child(
+  int ruby_regex: @ruby_regex ref,
+  int index: int ref,
+  unique int child: @ruby_regex_child_type ref
+);
+
+ruby_regex_def(
+  unique int id: @ruby_regex
+);
+
+ruby_rescue_body(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int body: @ruby_then ref
+);
+
+ruby_rescue_exceptions(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int exceptions: @ruby_exceptions ref
+);
+
+ruby_rescue_variable(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int variable: @ruby_exception_variable ref
+);
+
+ruby_rescue_def(
+  unique int id: @ruby_rescue
+);
+
+@ruby_rescue_modifier_body_type = @ruby_underscore_arg | @ruby_underscore_statement
+
+ruby_rescue_modifier_def(
+  unique int id: @ruby_rescue_modifier,
+  int body: @ruby_rescue_modifier_body_type ref,
+  int handler: @ruby_underscore_expression ref
+);
+
+ruby_rest_assignment_child(
+  unique int ruby_rest_assignment: @ruby_rest_assignment ref,
+  unique int child: @ruby_underscore_lhs ref
+);
+
+ruby_rest_assignment_def(
+  unique int id: @ruby_rest_assignment
+);
+
+ruby_retry_child(
+  unique int ruby_retry: @ruby_retry ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_retry_def(
+  unique int id: @ruby_retry
+);
+
+ruby_return_child(
+  unique int ruby_return: @ruby_return ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_return_def(
+  unique int id: @ruby_return
+);
+
+@ruby_right_assignment_list_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_right_assignment_list, index]
+ruby_right_assignment_list_child(
+  int ruby_right_assignment_list: @ruby_right_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_right_assignment_list_child_type ref
+);
+
+ruby_right_assignment_list_def(
+  unique int id: @ruby_right_assignment_list
+);
+
+@ruby_scope_resolution_scope_type = @ruby_underscore_pattern_constant | @ruby_underscore_primary
+
+ruby_scope_resolution_scope(
+  unique int ruby_scope_resolution: @ruby_scope_resolution ref,
+  unique int scope: @ruby_scope_resolution_scope_type ref
+);
+
+ruby_scope_resolution_def(
+  unique int id: @ruby_scope_resolution,
+  int name: @ruby_token_constant ref
+);
+
+ruby_setter_def(
+  unique int id: @ruby_setter,
+  int name: @ruby_token_identifier ref
+);
+
+ruby_singleton_class_body(
+  unique int ruby_singleton_class: @ruby_singleton_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_singleton_class_def(
+  unique int id: @ruby_singleton_class,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_singleton_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_singleton_method_body(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int body: @ruby_singleton_method_body_type ref
+);
+
+@ruby_singleton_method_object_type = @ruby_underscore_arg | @ruby_underscore_variable
+
+ruby_singleton_method_parameters(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_singleton_method_def(
+  unique int id: @ruby_singleton_method,
+  int name: @ruby_underscore_method_name ref,
+  int object: @ruby_singleton_method_object_type ref
+);
+
+ruby_splat_argument_child(
+  unique int ruby_splat_argument: @ruby_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_splat_argument_def(
+  unique int id: @ruby_splat_argument
+);
+
+ruby_splat_parameter_name(
+  unique int ruby_splat_parameter: @ruby_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_splat_parameter_def(
+  unique int id: @ruby_splat_parameter
+);
+
+@ruby_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_string__, index]
+ruby_string_child(
+  int ruby_string__: @ruby_string__ ref,
+  int index: int ref,
+  unique int child: @ruby_string_child_type ref
+);
+
+ruby_string_def(
+  unique int id: @ruby_string__
+);
+
+#keyset[ruby_string_array, index]
+ruby_string_array_child(
+  int ruby_string_array: @ruby_string_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string ref
+);
+
+ruby_string_array_def(
+  unique int id: @ruby_string_array
+);
+
+@ruby_subshell_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_subshell, index]
+ruby_subshell_child(
+  int ruby_subshell: @ruby_subshell ref,
+  int index: int ref,
+  unique int child: @ruby_subshell_child_type ref
+);
+
+ruby_subshell_def(
+  unique int id: @ruby_subshell
+);
+
+ruby_superclass_def(
+  unique int id: @ruby_superclass,
+  int child: @ruby_underscore_expression ref
+);
+
+#keyset[ruby_symbol_array, index]
+ruby_symbol_array_child(
+  int ruby_symbol_array: @ruby_symbol_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol ref
+);
+
+ruby_symbol_array_def(
+  unique int id: @ruby_symbol_array
+);
+
+ruby_test_pattern_def(
+  unique int id: @ruby_test_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_then_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_then, index]
+ruby_then_child(
+  int ruby_then: @ruby_then ref,
+  int index: int ref,
+  unique int child: @ruby_then_child_type ref
+);
+
+ruby_then_def(
+  unique int id: @ruby_then
+);
+
+@ruby_unary_operand_type = @ruby_parenthesized_statements | @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_unary.operator of
+  0 = @ruby_unary_bang
+| 1 = @ruby_unary_plus
+| 2 = @ruby_unary_minus
+| 3 = @ruby_unary_definedquestion
+| 4 = @ruby_unary_not
+| 5 = @ruby_unary_tilde
+;
+
+
+ruby_unary_def(
+  unique int id: @ruby_unary,
+  int operand: @ruby_unary_operand_type ref,
+  int operator: int ref
+);
+
+#keyset[ruby_undef, index]
+ruby_undef_child(
+  int ruby_undef: @ruby_undef ref,
+  int index: int ref,
+  unique int child: @ruby_underscore_method_name ref
+);
+
+ruby_undef_def(
+  unique int id: @ruby_undef
+);
+
+@ruby_unless_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_unless_alternative(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int alternative: @ruby_unless_alternative_type ref
+);
+
+ruby_unless_consequence(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_unless_def(
+  unique int id: @ruby_unless,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_unless_guard_def(
+  unique int id: @ruby_unless_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_unless_modifier_def(
+  unique int id: @ruby_unless_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_until_def(
+  unique int id: @ruby_until,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_until_modifier_def(
+  unique int id: @ruby_until_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+@ruby_variable_reference_pattern_name_type = @ruby_token_identifier | @ruby_underscore_nonlocal_variable
+
+ruby_variable_reference_pattern_def(
+  unique int id: @ruby_variable_reference_pattern,
+  int name: @ruby_variable_reference_pattern_name_type ref
+);
+
+ruby_when_body(
+  unique int ruby_when: @ruby_when ref,
+  unique int body: @ruby_then ref
+);
+
+#keyset[ruby_when, index]
+ruby_when_pattern(
+  int ruby_when: @ruby_when ref,
+  int index: int ref,
+  unique int pattern: @ruby_pattern ref
+);
+
+ruby_when_def(
+  unique int id: @ruby_when
+);
+
+ruby_while_def(
+  unique int id: @ruby_while,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_while_modifier_def(
+  unique int id: @ruby_while_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_yield_child(
+  unique int ruby_yield: @ruby_yield ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_yield_def(
+  unique int id: @ruby_yield
+);
+
+ruby_tokeninfo(
+  unique int id: @ruby_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @ruby_token.kind of
+  0 = @ruby_reserved_word
+| 1 = @ruby_token_character
+| 2 = @ruby_token_class_variable
+| 3 = @ruby_token_comment
+| 4 = @ruby_token_constant
+| 5 = @ruby_token_empty_statement
+| 6 = @ruby_token_encoding
+| 7 = @ruby_token_escape_sequence
+| 8 = @ruby_token_false
+| 9 = @ruby_token_file
+| 10 = @ruby_token_float
+| 11 = @ruby_token_forward_argument
+| 12 = @ruby_token_forward_parameter
+| 13 = @ruby_token_global_variable
+| 14 = @ruby_token_hash_key_symbol
+| 15 = @ruby_token_hash_splat_nil
+| 16 = @ruby_token_heredoc_beginning
+| 17 = @ruby_token_heredoc_content
+| 18 = @ruby_token_heredoc_end
+| 19 = @ruby_token_identifier
+| 20 = @ruby_token_instance_variable
+| 21 = @ruby_token_integer
+| 22 = @ruby_token_line
+| 23 = @ruby_token_nil
+| 24 = @ruby_token_operator
+| 25 = @ruby_token_self
+| 26 = @ruby_token_simple_symbol
+| 27 = @ruby_token_string_content
+| 28 = @ruby_token_super
+| 29 = @ruby_token_true
+| 30 = @ruby_token_uninterpreted
+;
+
+
+@ruby_ast_node = @ruby_alias | @ruby_alternative_pattern | @ruby_argument_list | @ruby_array | @ruby_array_pattern | @ruby_as_pattern | @ruby_assignment | @ruby_bare_string | @ruby_bare_symbol | @ruby_begin | @ruby_begin_block | @ruby_binary | @ruby_block | @ruby_block_argument | @ruby_block_body | @ruby_block_parameter | @ruby_block_parameters | @ruby_body_statement | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_complex | @ruby_conditional | @ruby_delimited_symbol | @ruby_destructured_left_assignment | @ruby_destructured_parameter | @ruby_do | @ruby_do_block | @ruby_element_reference | @ruby_else | @ruby_elsif | @ruby_end_block | @ruby_ensure | @ruby_exception_variable | @ruby_exceptions | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_for | @ruby_hash | @ruby_hash_pattern | @ruby_hash_splat_argument | @ruby_hash_splat_parameter | @ruby_heredoc_body | @ruby_if | @ruby_if_guard | @ruby_if_modifier | @ruby_in | @ruby_in_clause | @ruby_interpolation | @ruby_keyword_parameter | @ruby_keyword_pattern | @ruby_lambda | @ruby_lambda_parameters | @ruby_left_assignment_list | @ruby_match_pattern | @ruby_method | @ruby_method_parameters | @ruby_module | @ruby_next | @ruby_operator_assignment | @ruby_optional_parameter | @ruby_pair | @ruby_parenthesized_pattern | @ruby_parenthesized_statements | @ruby_pattern | @ruby_program | @ruby_range | @ruby_rational | @ruby_redo | @ruby_regex | @ruby_rescue | @ruby_rescue_modifier | @ruby_rest_assignment | @ruby_retry | @ruby_return | @ruby_right_assignment_list | @ruby_scope_resolution | @ruby_setter | @ruby_singleton_class | @ruby_singleton_method | @ruby_splat_argument | @ruby_splat_parameter | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_superclass | @ruby_symbol_array | @ruby_test_pattern | @ruby_then | @ruby_token | @ruby_unary | @ruby_undef | @ruby_unless | @ruby_unless_guard | @ruby_unless_modifier | @ruby_until | @ruby_until_modifier | @ruby_variable_reference_pattern | @ruby_when | @ruby_while | @ruby_while_modifier | @ruby_yield
+
+ruby_ast_node_location(
+  unique int node: @ruby_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+ruby_ast_node_parent(
+  unique int node: @ruby_ast_node ref,
+  int parent: @ruby_ast_node ref,
+  int parent_index: int ref
+);
+
+/*- Erb dbscheme -*/
+erb_comment_directive_child(
+  unique int erb_comment_directive: @erb_comment_directive ref,
+  unique int child: @erb_token_comment ref
+);
+
+erb_comment_directive_def(
+  unique int id: @erb_comment_directive
+);
+
+erb_directive_child(
+  unique int erb_directive: @erb_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_directive_def(
+  unique int id: @erb_directive
+);
+
+erb_graphql_directive_child(
+  unique int erb_graphql_directive: @erb_graphql_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_graphql_directive_def(
+  unique int id: @erb_graphql_directive
+);
+
+erb_output_directive_child(
+  unique int erb_output_directive: @erb_output_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_output_directive_def(
+  unique int id: @erb_output_directive
+);
+
+@erb_template_child_type = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_token_content
+
+#keyset[erb_template, index]
+erb_template_child(
+  int erb_template: @erb_template ref,
+  int index: int ref,
+  unique int child: @erb_template_child_type ref
+);
+
+erb_template_def(
+  unique int id: @erb_template
+);
+
+erb_tokeninfo(
+  unique int id: @erb_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @erb_token.kind of
+  0 = @erb_reserved_word
+| 1 = @erb_token_code
+| 2 = @erb_token_comment
+| 3 = @erb_token_content
+;
+
+
+@erb_ast_node = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_template | @erb_token
+
+erb_ast_node_location(
+  unique int node: @erb_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+erb_ast_node_parent(
+  unique int node: @erb_ast_node ref,
+  int parent: @erb_ast_node ref,
+  int parent_index: int ref
+);
+
diff --git a/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/ruby.dbscheme b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/ruby.dbscheme
new file mode 100644
index 00000000000..40a6b0a5e81
--- /dev/null
+++ b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/ruby.dbscheme
@@ -0,0 +1,1526 @@
+// CodeQL database schema for Ruby
+// Automatically generated from the tree-sitter grammar; do not edit
+
+/*- Files and folders -*/
+
+/**
+ * The location of an element.
+ * The location spans column `startcolumn` of line `startline` to
+ * column `endcolumn` of line `endline` in file `file`.
+ * For more information, see
+ * [Locations](https://codeql.github.com/docs/writing-codeql-queries/providing-locations-in-codeql-queries/).
+ */
+locations_default(
+  unique int id: @location_default,
+  int file: @file ref,
+  int beginLine: int ref,
+  int beginColumn: int ref,
+  int endLine: int ref,
+  int endColumn: int ref
+);
+
+files(
+  unique int id: @file,
+  string name: string ref
+);
+
+folders(
+  unique int id: @folder,
+  string name: string ref
+);
+
+@container = @file | @folder
+
+containerparent(
+  int parent: @container ref,
+  unique int child: @container ref
+);
+
+/*- Empty location -*/
+
+empty_location(
+  int location: @location_default ref
+);
+
+/*- Source location prefix -*/
+
+/**
+ * The source location of the snapshot.
+ */
+sourceLocationPrefix(string prefix : string ref);
+
+/*- Diagnostic messages -*/
+
+diagnostics(
+  unique int id: @diagnostic,
+  int severity: int ref,
+  string error_tag: string ref,
+  string error_message: string ref,
+  string full_error_message: string ref,
+  int location: @location_default ref
+);
+
+/*- Diagnostic messages: severity -*/
+
+case @diagnostic.severity of
+  10 = @diagnostic_debug
+| 20 = @diagnostic_info
+| 30 = @diagnostic_warning
+| 40 = @diagnostic_error
+;
+
+/*- YAML -*/
+
+#keyset[parent, idx]
+yaml (unique int id: @yaml_node,
+      int kind: int ref,
+      int parent: @yaml_node_parent ref,
+      int idx: int ref,
+      string tag: string ref,
+      string tostring: string ref);
+
+case @yaml_node.kind of
+  0 = @yaml_scalar_node
+| 1 = @yaml_mapping_node
+| 2 = @yaml_sequence_node
+| 3 = @yaml_alias_node
+;
+
+@yaml_collection_node = @yaml_mapping_node | @yaml_sequence_node;
+
+@yaml_node_parent = @yaml_collection_node | @file;
+
+yaml_anchors (unique int node: @yaml_node ref,
+              string anchor: string ref);
+
+yaml_aliases (unique int alias: @yaml_alias_node ref,
+              string target: string ref);
+
+yaml_scalars (unique int scalar: @yaml_scalar_node ref,
+              int style: int ref,
+              string value: string ref);
+
+yaml_errors (unique int id: @yaml_error,
+             string message: string ref);
+
+yaml_locations(unique int locatable: @yaml_locatable ref,
+             int location: @location_default ref);
+
+@yaml_locatable = @yaml_node | @yaml_error;
+
+/*- Ruby dbscheme -*/
+@ruby_underscore_arg = @ruby_assignment | @ruby_binary | @ruby_conditional | @ruby_operator_assignment | @ruby_range | @ruby_unary | @ruby_underscore_primary
+
+@ruby_underscore_call_operator = @ruby_reserved_word
+
+@ruby_underscore_expression = @ruby_assignment | @ruby_binary | @ruby_break | @ruby_call | @ruby_match_pattern | @ruby_next | @ruby_operator_assignment | @ruby_return | @ruby_test_pattern | @ruby_unary | @ruby_underscore_arg | @ruby_yield
+
+@ruby_underscore_lhs = @ruby_call | @ruby_element_reference | @ruby_scope_resolution | @ruby_token_false | @ruby_token_nil | @ruby_token_true | @ruby_underscore_variable
+
+@ruby_underscore_method_name = @ruby_delimited_symbol | @ruby_setter | @ruby_token_constant | @ruby_token_identifier | @ruby_token_operator | @ruby_token_simple_symbol | @ruby_underscore_nonlocal_variable
+
+@ruby_underscore_nonlocal_variable = @ruby_token_class_variable | @ruby_token_global_variable | @ruby_token_instance_variable
+
+@ruby_underscore_pattern_constant = @ruby_scope_resolution | @ruby_token_constant
+
+@ruby_underscore_pattern_expr = @ruby_alternative_pattern | @ruby_as_pattern | @ruby_underscore_pattern_expr_basic
+
+@ruby_underscore_pattern_expr_basic = @ruby_array_pattern | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_parenthesized_pattern | @ruby_range | @ruby_token_identifier | @ruby_underscore_pattern_constant | @ruby_underscore_pattern_primitive | @ruby_variable_reference_pattern
+
+@ruby_underscore_pattern_primitive = @ruby_delimited_symbol | @ruby_lambda | @ruby_regex | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_encoding | @ruby_token_false | @ruby_token_file | @ruby_token_heredoc_beginning | @ruby_token_line | @ruby_token_nil | @ruby_token_self | @ruby_token_simple_symbol | @ruby_token_true | @ruby_unary | @ruby_underscore_simple_numeric
+
+@ruby_underscore_pattern_top_expr_body = @ruby_array_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_underscore_pattern_expr
+
+@ruby_underscore_primary = @ruby_array | @ruby_begin | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_delimited_symbol | @ruby_for | @ruby_hash | @ruby_if | @ruby_lambda | @ruby_method | @ruby_module | @ruby_next | @ruby_parenthesized_statements | @ruby_redo | @ruby_regex | @ruby_retry | @ruby_return | @ruby_singleton_class | @ruby_singleton_method | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_character | @ruby_token_heredoc_beginning | @ruby_token_simple_symbol | @ruby_unary | @ruby_underscore_lhs | @ruby_underscore_simple_numeric | @ruby_unless | @ruby_until | @ruby_while | @ruby_yield
+
+@ruby_underscore_simple_numeric = @ruby_complex | @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+@ruby_underscore_statement = @ruby_alias | @ruby_begin_block | @ruby_end_block | @ruby_if_modifier | @ruby_rescue_modifier | @ruby_undef | @ruby_underscore_expression | @ruby_unless_modifier | @ruby_until_modifier | @ruby_while_modifier
+
+@ruby_underscore_variable = @ruby_token_constant | @ruby_token_identifier | @ruby_token_self | @ruby_token_super | @ruby_underscore_nonlocal_variable
+
+ruby_alias_def(
+  unique int id: @ruby_alias,
+  int alias: @ruby_underscore_method_name ref,
+  int name: @ruby_underscore_method_name ref
+);
+
+#keyset[ruby_alternative_pattern, index]
+ruby_alternative_pattern_alternatives(
+  int ruby_alternative_pattern: @ruby_alternative_pattern ref,
+  int index: int ref,
+  unique int alternatives: @ruby_underscore_pattern_expr_basic ref
+);
+
+ruby_alternative_pattern_def(
+  unique int id: @ruby_alternative_pattern
+);
+
+@ruby_argument_list_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_argument_list, index]
+ruby_argument_list_child(
+  int ruby_argument_list: @ruby_argument_list ref,
+  int index: int ref,
+  unique int child: @ruby_argument_list_child_type ref
+);
+
+ruby_argument_list_def(
+  unique int id: @ruby_argument_list
+);
+
+@ruby_array_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_array, index]
+ruby_array_child(
+  int ruby_array: @ruby_array ref,
+  int index: int ref,
+  unique int child: @ruby_array_child_type ref
+);
+
+ruby_array_def(
+  unique int id: @ruby_array
+);
+
+ruby_array_pattern_class(
+  unique int ruby_array_pattern: @ruby_array_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_array_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_array_pattern, index]
+ruby_array_pattern_child(
+  int ruby_array_pattern: @ruby_array_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_array_pattern_child_type ref
+);
+
+ruby_array_pattern_def(
+  unique int id: @ruby_array_pattern
+);
+
+ruby_as_pattern_def(
+  unique int id: @ruby_as_pattern,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_assignment_left_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+@ruby_assignment_right_type = @ruby_rescue_modifier | @ruby_right_assignment_list | @ruby_splat_argument | @ruby_underscore_expression
+
+ruby_assignment_def(
+  unique int id: @ruby_assignment,
+  int left: @ruby_assignment_left_type ref,
+  int right: @ruby_assignment_right_type ref
+);
+
+@ruby_bare_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_string, index]
+ruby_bare_string_child(
+  int ruby_bare_string: @ruby_bare_string ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string_child_type ref
+);
+
+ruby_bare_string_def(
+  unique int id: @ruby_bare_string
+);
+
+@ruby_bare_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_symbol, index]
+ruby_bare_symbol_child(
+  int ruby_bare_symbol: @ruby_bare_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol_child_type ref
+);
+
+ruby_bare_symbol_def(
+  unique int id: @ruby_bare_symbol
+);
+
+@ruby_begin_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin, index]
+ruby_begin_child(
+  int ruby_begin: @ruby_begin ref,
+  int index: int ref,
+  unique int child: @ruby_begin_child_type ref
+);
+
+ruby_begin_def(
+  unique int id: @ruby_begin
+);
+
+@ruby_begin_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin_block, index]
+ruby_begin_block_child(
+  int ruby_begin_block: @ruby_begin_block ref,
+  int index: int ref,
+  unique int child: @ruby_begin_block_child_type ref
+);
+
+ruby_begin_block_def(
+  unique int id: @ruby_begin_block
+);
+
+@ruby_binary_left_type = @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_binary.operator of
+  0 = @ruby_binary_bangequal
+| 1 = @ruby_binary_bangtilde
+| 2 = @ruby_binary_percent
+| 3 = @ruby_binary_ampersand
+| 4 = @ruby_binary_ampersandampersand
+| 5 = @ruby_binary_star
+| 6 = @ruby_binary_starstar
+| 7 = @ruby_binary_plus
+| 8 = @ruby_binary_minus
+| 9 = @ruby_binary_slash
+| 10 = @ruby_binary_langle
+| 11 = @ruby_binary_langlelangle
+| 12 = @ruby_binary_langleequal
+| 13 = @ruby_binary_langleequalrangle
+| 14 = @ruby_binary_equalequal
+| 15 = @ruby_binary_equalequalequal
+| 16 = @ruby_binary_equaltilde
+| 17 = @ruby_binary_rangle
+| 18 = @ruby_binary_rangleequal
+| 19 = @ruby_binary_ranglerangle
+| 20 = @ruby_binary_caret
+| 21 = @ruby_binary_and
+| 22 = @ruby_binary_or
+| 23 = @ruby_binary_pipe
+| 24 = @ruby_binary_pipepipe
+;
+
+
+ruby_binary_def(
+  unique int id: @ruby_binary,
+  int left: @ruby_binary_left_type ref,
+  int operator: int ref,
+  int right: @ruby_underscore_expression ref
+);
+
+ruby_block_body(
+  unique int ruby_block: @ruby_block ref,
+  unique int body: @ruby_block_body ref
+);
+
+ruby_block_parameters(
+  unique int ruby_block: @ruby_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_block_def(
+  unique int id: @ruby_block
+);
+
+ruby_block_argument_child(
+  unique int ruby_block_argument: @ruby_block_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_block_argument_def(
+  unique int id: @ruby_block_argument
+);
+
+@ruby_block_body_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_block_body, index]
+ruby_block_body_child(
+  int ruby_block_body: @ruby_block_body ref,
+  int index: int ref,
+  unique int child: @ruby_block_body_child_type ref
+);
+
+ruby_block_body_def(
+  unique int id: @ruby_block_body
+);
+
+ruby_block_parameter_name(
+  unique int ruby_block_parameter: @ruby_block_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_block_parameter_def(
+  unique int id: @ruby_block_parameter
+);
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_locals(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int locals: @ruby_token_identifier ref
+);
+
+@ruby_block_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_child(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_block_parameters_child_type ref
+);
+
+ruby_block_parameters_def(
+  unique int id: @ruby_block_parameters
+);
+
+@ruby_body_statement_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_body_statement, index]
+ruby_body_statement_child(
+  int ruby_body_statement: @ruby_body_statement ref,
+  int index: int ref,
+  unique int child: @ruby_body_statement_child_type ref
+);
+
+ruby_body_statement_def(
+  unique int id: @ruby_body_statement
+);
+
+ruby_break_child(
+  unique int ruby_break: @ruby_break ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_break_def(
+  unique int id: @ruby_break
+);
+
+ruby_call_arguments(
+  unique int ruby_call: @ruby_call ref,
+  unique int arguments: @ruby_argument_list ref
+);
+
+@ruby_call_block_type = @ruby_block | @ruby_do_block
+
+ruby_call_block(
+  unique int ruby_call: @ruby_call ref,
+  unique int block: @ruby_call_block_type ref
+);
+
+@ruby_call_method_type = @ruby_token_operator | @ruby_underscore_variable
+
+ruby_call_method(
+  unique int ruby_call: @ruby_call ref,
+  unique int method: @ruby_call_method_type ref
+);
+
+ruby_call_operator(
+  unique int ruby_call: @ruby_call ref,
+  unique int operator: @ruby_underscore_call_operator ref
+);
+
+ruby_call_receiver(
+  unique int ruby_call: @ruby_call ref,
+  unique int receiver: @ruby_underscore_primary ref
+);
+
+ruby_call_def(
+  unique int id: @ruby_call
+);
+
+ruby_case_value(
+  unique int ruby_case__: @ruby_case__ ref,
+  unique int value: @ruby_underscore_statement ref
+);
+
+@ruby_case_child_type = @ruby_else | @ruby_when
+
+#keyset[ruby_case__, index]
+ruby_case_child(
+  int ruby_case__: @ruby_case__ ref,
+  int index: int ref,
+  unique int child: @ruby_case_child_type ref
+);
+
+ruby_case_def(
+  unique int id: @ruby_case__
+);
+
+#keyset[ruby_case_match, index]
+ruby_case_match_clauses(
+  int ruby_case_match: @ruby_case_match ref,
+  int index: int ref,
+  unique int clauses: @ruby_in_clause ref
+);
+
+ruby_case_match_else(
+  unique int ruby_case_match: @ruby_case_match ref,
+  unique int else: @ruby_else ref
+);
+
+ruby_case_match_def(
+  unique int id: @ruby_case_match,
+  int value: @ruby_underscore_statement ref
+);
+
+#keyset[ruby_chained_string, index]
+ruby_chained_string_child(
+  int ruby_chained_string: @ruby_chained_string ref,
+  int index: int ref,
+  unique int child: @ruby_string__ ref
+);
+
+ruby_chained_string_def(
+  unique int id: @ruby_chained_string
+);
+
+ruby_class_body(
+  unique int ruby_class: @ruby_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_class_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_class_superclass(
+  unique int ruby_class: @ruby_class ref,
+  unique int superclass: @ruby_superclass ref
+);
+
+ruby_class_def(
+  unique int id: @ruby_class,
+  int name: @ruby_class_name_type ref
+);
+
+@ruby_complex_child_type = @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+ruby_complex_def(
+  unique int id: @ruby_complex,
+  int child: @ruby_complex_child_type ref
+);
+
+ruby_conditional_def(
+  unique int id: @ruby_conditional,
+  int alternative: @ruby_underscore_arg ref,
+  int condition: @ruby_underscore_arg ref,
+  int consequence: @ruby_underscore_arg ref
+);
+
+@ruby_delimited_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_delimited_symbol, index]
+ruby_delimited_symbol_child(
+  int ruby_delimited_symbol: @ruby_delimited_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_delimited_symbol_child_type ref
+);
+
+ruby_delimited_symbol_def(
+  unique int id: @ruby_delimited_symbol
+);
+
+@ruby_destructured_left_assignment_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_destructured_left_assignment, index]
+ruby_destructured_left_assignment_child(
+  int ruby_destructured_left_assignment: @ruby_destructured_left_assignment ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_left_assignment_child_type ref
+);
+
+ruby_destructured_left_assignment_def(
+  unique int id: @ruby_destructured_left_assignment
+);
+
+@ruby_destructured_parameter_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_destructured_parameter, index]
+ruby_destructured_parameter_child(
+  int ruby_destructured_parameter: @ruby_destructured_parameter ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_parameter_child_type ref
+);
+
+ruby_destructured_parameter_def(
+  unique int id: @ruby_destructured_parameter
+);
+
+@ruby_do_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_do, index]
+ruby_do_child(
+  int ruby_do: @ruby_do ref,
+  int index: int ref,
+  unique int child: @ruby_do_child_type ref
+);
+
+ruby_do_def(
+  unique int id: @ruby_do
+);
+
+ruby_do_block_body(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_do_block_parameters(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_do_block_def(
+  unique int id: @ruby_do_block
+);
+
+@ruby_element_reference_block_type = @ruby_block | @ruby_do_block
+
+ruby_element_reference_block(
+  unique int ruby_element_reference: @ruby_element_reference ref,
+  unique int block: @ruby_element_reference_block_type ref
+);
+
+@ruby_element_reference_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_element_reference, index]
+ruby_element_reference_child(
+  int ruby_element_reference: @ruby_element_reference ref,
+  int index: int ref,
+  unique int child: @ruby_element_reference_child_type ref
+);
+
+ruby_element_reference_def(
+  unique int id: @ruby_element_reference,
+  int object: @ruby_underscore_primary ref
+);
+
+@ruby_else_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_else, index]
+ruby_else_child(
+  int ruby_else: @ruby_else ref,
+  int index: int ref,
+  unique int child: @ruby_else_child_type ref
+);
+
+ruby_else_def(
+  unique int id: @ruby_else
+);
+
+@ruby_elsif_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_elsif_alternative(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int alternative: @ruby_elsif_alternative_type ref
+);
+
+ruby_elsif_consequence(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_elsif_def(
+  unique int id: @ruby_elsif,
+  int condition: @ruby_underscore_statement ref
+);
+
+@ruby_end_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_end_block, index]
+ruby_end_block_child(
+  int ruby_end_block: @ruby_end_block ref,
+  int index: int ref,
+  unique int child: @ruby_end_block_child_type ref
+);
+
+ruby_end_block_def(
+  unique int id: @ruby_end_block
+);
+
+@ruby_ensure_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_ensure, index]
+ruby_ensure_child(
+  int ruby_ensure: @ruby_ensure ref,
+  int index: int ref,
+  unique int child: @ruby_ensure_child_type ref
+);
+
+ruby_ensure_def(
+  unique int id: @ruby_ensure
+);
+
+ruby_exception_variable_def(
+  unique int id: @ruby_exception_variable,
+  int child: @ruby_underscore_lhs ref
+);
+
+@ruby_exceptions_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_exceptions, index]
+ruby_exceptions_child(
+  int ruby_exceptions: @ruby_exceptions ref,
+  int index: int ref,
+  unique int child: @ruby_exceptions_child_type ref
+);
+
+ruby_exceptions_def(
+  unique int id: @ruby_exceptions
+);
+
+ruby_expression_reference_pattern_def(
+  unique int id: @ruby_expression_reference_pattern,
+  int value: @ruby_underscore_expression ref
+);
+
+ruby_find_pattern_class(
+  unique int ruby_find_pattern: @ruby_find_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_find_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_find_pattern, index]
+ruby_find_pattern_child(
+  int ruby_find_pattern: @ruby_find_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_find_pattern_child_type ref
+);
+
+ruby_find_pattern_def(
+  unique int id: @ruby_find_pattern
+);
+
+@ruby_for_pattern_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+ruby_for_def(
+  unique int id: @ruby_for,
+  int body: @ruby_do ref,
+  int pattern: @ruby_for_pattern_type ref,
+  int value: @ruby_in ref
+);
+
+@ruby_hash_child_type = @ruby_hash_splat_argument | @ruby_pair
+
+#keyset[ruby_hash, index]
+ruby_hash_child(
+  int ruby_hash: @ruby_hash ref,
+  int index: int ref,
+  unique int child: @ruby_hash_child_type ref
+);
+
+ruby_hash_def(
+  unique int id: @ruby_hash
+);
+
+ruby_hash_pattern_class(
+  unique int ruby_hash_pattern: @ruby_hash_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_hash_pattern_child_type = @ruby_hash_splat_parameter | @ruby_keyword_pattern | @ruby_token_hash_splat_nil
+
+#keyset[ruby_hash_pattern, index]
+ruby_hash_pattern_child(
+  int ruby_hash_pattern: @ruby_hash_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_hash_pattern_child_type ref
+);
+
+ruby_hash_pattern_def(
+  unique int id: @ruby_hash_pattern
+);
+
+ruby_hash_splat_argument_child(
+  unique int ruby_hash_splat_argument: @ruby_hash_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_hash_splat_argument_def(
+  unique int id: @ruby_hash_splat_argument
+);
+
+ruby_hash_splat_parameter_name(
+  unique int ruby_hash_splat_parameter: @ruby_hash_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_hash_splat_parameter_def(
+  unique int id: @ruby_hash_splat_parameter
+);
+
+@ruby_heredoc_body_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_heredoc_content | @ruby_token_heredoc_end
+
+#keyset[ruby_heredoc_body, index]
+ruby_heredoc_body_child(
+  int ruby_heredoc_body: @ruby_heredoc_body ref,
+  int index: int ref,
+  unique int child: @ruby_heredoc_body_child_type ref
+);
+
+ruby_heredoc_body_def(
+  unique int id: @ruby_heredoc_body
+);
+
+@ruby_if_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_if_alternative(
+  unique int ruby_if: @ruby_if ref,
+  unique int alternative: @ruby_if_alternative_type ref
+);
+
+ruby_if_consequence(
+  unique int ruby_if: @ruby_if ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_if_def(
+  unique int id: @ruby_if,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_if_guard_def(
+  unique int id: @ruby_if_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_if_modifier_def(
+  unique int id: @ruby_if_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_in_def(
+  unique int id: @ruby_in,
+  int child: @ruby_underscore_arg ref
+);
+
+ruby_in_clause_body(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int body: @ruby_then ref
+);
+
+@ruby_in_clause_guard_type = @ruby_if_guard | @ruby_unless_guard
+
+ruby_in_clause_guard(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int guard: @ruby_in_clause_guard_type ref
+);
+
+ruby_in_clause_def(
+  unique int id: @ruby_in_clause,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref
+);
+
+@ruby_interpolation_child_type = @ruby_token_empty_statement | @ruby_underscore_nonlocal_variable | @ruby_underscore_statement
+
+#keyset[ruby_interpolation, index]
+ruby_interpolation_child(
+  int ruby_interpolation: @ruby_interpolation ref,
+  int index: int ref,
+  unique int child: @ruby_interpolation_child_type ref
+);
+
+ruby_interpolation_def(
+  unique int id: @ruby_interpolation
+);
+
+ruby_keyword_parameter_value(
+  unique int ruby_keyword_parameter: @ruby_keyword_parameter ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_keyword_parameter_def(
+  unique int id: @ruby_keyword_parameter,
+  int name: @ruby_token_identifier ref
+);
+
+@ruby_keyword_pattern_key_type = @ruby_string__ | @ruby_token_hash_key_symbol
+
+ruby_keyword_pattern_value(
+  unique int ruby_keyword_pattern: @ruby_keyword_pattern ref,
+  unique int value: @ruby_underscore_pattern_expr ref
+);
+
+ruby_keyword_pattern_def(
+  unique int id: @ruby_keyword_pattern,
+  int key__: @ruby_keyword_pattern_key_type ref
+);
+
+@ruby_lambda_body_type = @ruby_block | @ruby_do_block
+
+ruby_lambda_parameters(
+  unique int ruby_lambda: @ruby_lambda ref,
+  unique int parameters: @ruby_lambda_parameters ref
+);
+
+ruby_lambda_def(
+  unique int id: @ruby_lambda,
+  int body: @ruby_lambda_body_type ref
+);
+
+@ruby_lambda_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_lambda_parameters, index]
+ruby_lambda_parameters_child(
+  int ruby_lambda_parameters: @ruby_lambda_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_lambda_parameters_child_type ref
+);
+
+ruby_lambda_parameters_def(
+  unique int id: @ruby_lambda_parameters
+);
+
+@ruby_left_assignment_list_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_left_assignment_list, index]
+ruby_left_assignment_list_child(
+  int ruby_left_assignment_list: @ruby_left_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_left_assignment_list_child_type ref
+);
+
+ruby_left_assignment_list_def(
+  unique int id: @ruby_left_assignment_list
+);
+
+ruby_match_pattern_def(
+  unique int id: @ruby_match_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_method_body(
+  unique int ruby_method: @ruby_method ref,
+  unique int body: @ruby_method_body_type ref
+);
+
+ruby_method_parameters(
+  unique int ruby_method: @ruby_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_method_def(
+  unique int id: @ruby_method,
+  int name: @ruby_underscore_method_name ref
+);
+
+@ruby_method_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_method_parameters, index]
+ruby_method_parameters_child(
+  int ruby_method_parameters: @ruby_method_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_method_parameters_child_type ref
+);
+
+ruby_method_parameters_def(
+  unique int id: @ruby_method_parameters
+);
+
+ruby_module_body(
+  unique int ruby_module: @ruby_module ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_module_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_module_def(
+  unique int id: @ruby_module,
+  int name: @ruby_module_name_type ref
+);
+
+ruby_next_child(
+  unique int ruby_next: @ruby_next ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_next_def(
+  unique int id: @ruby_next
+);
+
+case @ruby_operator_assignment.operator of
+  0 = @ruby_operator_assignment_percentequal
+| 1 = @ruby_operator_assignment_ampersandampersandequal
+| 2 = @ruby_operator_assignment_ampersandequal
+| 3 = @ruby_operator_assignment_starstarequal
+| 4 = @ruby_operator_assignment_starequal
+| 5 = @ruby_operator_assignment_plusequal
+| 6 = @ruby_operator_assignment_minusequal
+| 7 = @ruby_operator_assignment_slashequal
+| 8 = @ruby_operator_assignment_langlelangleequal
+| 9 = @ruby_operator_assignment_ranglerangleequal
+| 10 = @ruby_operator_assignment_caretequal
+| 11 = @ruby_operator_assignment_pipeequal
+| 12 = @ruby_operator_assignment_pipepipeequal
+;
+
+
+@ruby_operator_assignment_right_type = @ruby_rescue_modifier | @ruby_underscore_expression
+
+ruby_operator_assignment_def(
+  unique int id: @ruby_operator_assignment,
+  int left: @ruby_underscore_lhs ref,
+  int operator: int ref,
+  int right: @ruby_operator_assignment_right_type ref
+);
+
+ruby_optional_parameter_def(
+  unique int id: @ruby_optional_parameter,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_pair_key_type = @ruby_string__ | @ruby_token_hash_key_symbol | @ruby_underscore_arg
+
+ruby_pair_value(
+  unique int ruby_pair: @ruby_pair ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_pair_def(
+  unique int id: @ruby_pair,
+  int key__: @ruby_pair_key_type ref
+);
+
+ruby_parenthesized_pattern_def(
+  unique int id: @ruby_parenthesized_pattern,
+  int child: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_parenthesized_statements_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_parenthesized_statements, index]
+ruby_parenthesized_statements_child(
+  int ruby_parenthesized_statements: @ruby_parenthesized_statements ref,
+  int index: int ref,
+  unique int child: @ruby_parenthesized_statements_child_type ref
+);
+
+ruby_parenthesized_statements_def(
+  unique int id: @ruby_parenthesized_statements
+);
+
+@ruby_pattern_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+ruby_pattern_def(
+  unique int id: @ruby_pattern,
+  int child: @ruby_pattern_child_type ref
+);
+
+@ruby_program_child_type = @ruby_token_empty_statement | @ruby_token_uninterpreted | @ruby_underscore_statement
+
+#keyset[ruby_program, index]
+ruby_program_child(
+  int ruby_program: @ruby_program ref,
+  int index: int ref,
+  unique int child: @ruby_program_child_type ref
+);
+
+ruby_program_def(
+  unique int id: @ruby_program
+);
+
+@ruby_range_begin_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_begin(
+  unique int ruby_range: @ruby_range ref,
+  unique int begin: @ruby_range_begin_type ref
+);
+
+@ruby_range_end_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_end(
+  unique int ruby_range: @ruby_range ref,
+  unique int end: @ruby_range_end_type ref
+);
+
+case @ruby_range.operator of
+  0 = @ruby_range_dotdot
+| 1 = @ruby_range_dotdotdot
+;
+
+
+ruby_range_def(
+  unique int id: @ruby_range,
+  int operator: int ref
+);
+
+@ruby_rational_child_type = @ruby_token_float | @ruby_token_integer
+
+ruby_rational_def(
+  unique int id: @ruby_rational,
+  int child: @ruby_rational_child_type ref
+);
+
+ruby_redo_child(
+  unique int ruby_redo: @ruby_redo ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_redo_def(
+  unique int id: @ruby_redo
+);
+
+@ruby_regex_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_regex, index]
+ruby_regex_child(
+  int ruby_regex: @ruby_regex ref,
+  int index: int ref,
+  unique int child: @ruby_regex_child_type ref
+);
+
+ruby_regex_def(
+  unique int id: @ruby_regex
+);
+
+ruby_rescue_body(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int body: @ruby_then ref
+);
+
+ruby_rescue_exceptions(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int exceptions: @ruby_exceptions ref
+);
+
+ruby_rescue_variable(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int variable: @ruby_exception_variable ref
+);
+
+ruby_rescue_def(
+  unique int id: @ruby_rescue
+);
+
+@ruby_rescue_modifier_body_type = @ruby_underscore_arg | @ruby_underscore_statement
+
+ruby_rescue_modifier_def(
+  unique int id: @ruby_rescue_modifier,
+  int body: @ruby_rescue_modifier_body_type ref,
+  int handler: @ruby_underscore_expression ref
+);
+
+ruby_rest_assignment_child(
+  unique int ruby_rest_assignment: @ruby_rest_assignment ref,
+  unique int child: @ruby_underscore_lhs ref
+);
+
+ruby_rest_assignment_def(
+  unique int id: @ruby_rest_assignment
+);
+
+ruby_retry_child(
+  unique int ruby_retry: @ruby_retry ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_retry_def(
+  unique int id: @ruby_retry
+);
+
+ruby_return_child(
+  unique int ruby_return: @ruby_return ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_return_def(
+  unique int id: @ruby_return
+);
+
+@ruby_right_assignment_list_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_right_assignment_list, index]
+ruby_right_assignment_list_child(
+  int ruby_right_assignment_list: @ruby_right_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_right_assignment_list_child_type ref
+);
+
+ruby_right_assignment_list_def(
+  unique int id: @ruby_right_assignment_list
+);
+
+@ruby_scope_resolution_scope_type = @ruby_underscore_pattern_constant | @ruby_underscore_primary
+
+ruby_scope_resolution_scope(
+  unique int ruby_scope_resolution: @ruby_scope_resolution ref,
+  unique int scope: @ruby_scope_resolution_scope_type ref
+);
+
+ruby_scope_resolution_def(
+  unique int id: @ruby_scope_resolution,
+  int name: @ruby_token_constant ref
+);
+
+ruby_setter_def(
+  unique int id: @ruby_setter,
+  int name: @ruby_token_identifier ref
+);
+
+ruby_singleton_class_body(
+  unique int ruby_singleton_class: @ruby_singleton_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_singleton_class_def(
+  unique int id: @ruby_singleton_class,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_singleton_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_singleton_method_body(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int body: @ruby_singleton_method_body_type ref
+);
+
+@ruby_singleton_method_object_type = @ruby_underscore_arg | @ruby_underscore_variable
+
+ruby_singleton_method_parameters(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_singleton_method_def(
+  unique int id: @ruby_singleton_method,
+  int name: @ruby_underscore_method_name ref,
+  int object: @ruby_singleton_method_object_type ref
+);
+
+ruby_splat_argument_child(
+  unique int ruby_splat_argument: @ruby_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_splat_argument_def(
+  unique int id: @ruby_splat_argument
+);
+
+ruby_splat_parameter_name(
+  unique int ruby_splat_parameter: @ruby_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_splat_parameter_def(
+  unique int id: @ruby_splat_parameter
+);
+
+@ruby_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_string__, index]
+ruby_string_child(
+  int ruby_string__: @ruby_string__ ref,
+  int index: int ref,
+  unique int child: @ruby_string_child_type ref
+);
+
+ruby_string_def(
+  unique int id: @ruby_string__
+);
+
+#keyset[ruby_string_array, index]
+ruby_string_array_child(
+  int ruby_string_array: @ruby_string_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string ref
+);
+
+ruby_string_array_def(
+  unique int id: @ruby_string_array
+);
+
+@ruby_subshell_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_subshell, index]
+ruby_subshell_child(
+  int ruby_subshell: @ruby_subshell ref,
+  int index: int ref,
+  unique int child: @ruby_subshell_child_type ref
+);
+
+ruby_subshell_def(
+  unique int id: @ruby_subshell
+);
+
+ruby_superclass_def(
+  unique int id: @ruby_superclass,
+  int child: @ruby_underscore_expression ref
+);
+
+#keyset[ruby_symbol_array, index]
+ruby_symbol_array_child(
+  int ruby_symbol_array: @ruby_symbol_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol ref
+);
+
+ruby_symbol_array_def(
+  unique int id: @ruby_symbol_array
+);
+
+ruby_test_pattern_def(
+  unique int id: @ruby_test_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_then_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_then, index]
+ruby_then_child(
+  int ruby_then: @ruby_then ref,
+  int index: int ref,
+  unique int child: @ruby_then_child_type ref
+);
+
+ruby_then_def(
+  unique int id: @ruby_then
+);
+
+@ruby_unary_operand_type = @ruby_parenthesized_statements | @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_unary.operator of
+  0 = @ruby_unary_bang
+| 1 = @ruby_unary_plus
+| 2 = @ruby_unary_minus
+| 3 = @ruby_unary_definedquestion
+| 4 = @ruby_unary_not
+| 5 = @ruby_unary_tilde
+;
+
+
+ruby_unary_def(
+  unique int id: @ruby_unary,
+  int operand: @ruby_unary_operand_type ref,
+  int operator: int ref
+);
+
+#keyset[ruby_undef, index]
+ruby_undef_child(
+  int ruby_undef: @ruby_undef ref,
+  int index: int ref,
+  unique int child: @ruby_underscore_method_name ref
+);
+
+ruby_undef_def(
+  unique int id: @ruby_undef
+);
+
+@ruby_unless_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_unless_alternative(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int alternative: @ruby_unless_alternative_type ref
+);
+
+ruby_unless_consequence(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_unless_def(
+  unique int id: @ruby_unless,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_unless_guard_def(
+  unique int id: @ruby_unless_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_unless_modifier_def(
+  unique int id: @ruby_unless_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_until_def(
+  unique int id: @ruby_until,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_until_modifier_def(
+  unique int id: @ruby_until_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+@ruby_variable_reference_pattern_name_type = @ruby_token_identifier | @ruby_underscore_nonlocal_variable
+
+ruby_variable_reference_pattern_def(
+  unique int id: @ruby_variable_reference_pattern,
+  int name: @ruby_variable_reference_pattern_name_type ref
+);
+
+ruby_when_body(
+  unique int ruby_when: @ruby_when ref,
+  unique int body: @ruby_then ref
+);
+
+#keyset[ruby_when, index]
+ruby_when_pattern(
+  int ruby_when: @ruby_when ref,
+  int index: int ref,
+  unique int pattern: @ruby_pattern ref
+);
+
+ruby_when_def(
+  unique int id: @ruby_when
+);
+
+ruby_while_def(
+  unique int id: @ruby_while,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_while_modifier_def(
+  unique int id: @ruby_while_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_yield_child(
+  unique int ruby_yield: @ruby_yield ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_yield_def(
+  unique int id: @ruby_yield
+);
+
+ruby_tokeninfo(
+  unique int id: @ruby_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @ruby_token.kind of
+  0 = @ruby_reserved_word
+| 1 = @ruby_token_character
+| 2 = @ruby_token_class_variable
+| 3 = @ruby_token_comment
+| 4 = @ruby_token_constant
+| 5 = @ruby_token_empty_statement
+| 6 = @ruby_token_encoding
+| 7 = @ruby_token_escape_sequence
+| 8 = @ruby_token_false
+| 9 = @ruby_token_file
+| 10 = @ruby_token_float
+| 11 = @ruby_token_forward_argument
+| 12 = @ruby_token_forward_parameter
+| 13 = @ruby_token_global_variable
+| 14 = @ruby_token_hash_key_symbol
+| 15 = @ruby_token_hash_splat_nil
+| 16 = @ruby_token_heredoc_beginning
+| 17 = @ruby_token_heredoc_content
+| 18 = @ruby_token_heredoc_end
+| 19 = @ruby_token_identifier
+| 20 = @ruby_token_instance_variable
+| 21 = @ruby_token_integer
+| 22 = @ruby_token_line
+| 23 = @ruby_token_nil
+| 24 = @ruby_token_operator
+| 25 = @ruby_token_self
+| 26 = @ruby_token_simple_symbol
+| 27 = @ruby_token_string_content
+| 28 = @ruby_token_super
+| 29 = @ruby_token_true
+| 30 = @ruby_token_uninterpreted
+;
+
+
+@ruby_ast_node = @ruby_alias | @ruby_alternative_pattern | @ruby_argument_list | @ruby_array | @ruby_array_pattern | @ruby_as_pattern | @ruby_assignment | @ruby_bare_string | @ruby_bare_symbol | @ruby_begin | @ruby_begin_block | @ruby_binary | @ruby_block | @ruby_block_argument | @ruby_block_body | @ruby_block_parameter | @ruby_block_parameters | @ruby_body_statement | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_complex | @ruby_conditional | @ruby_delimited_symbol | @ruby_destructured_left_assignment | @ruby_destructured_parameter | @ruby_do | @ruby_do_block | @ruby_element_reference | @ruby_else | @ruby_elsif | @ruby_end_block | @ruby_ensure | @ruby_exception_variable | @ruby_exceptions | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_for | @ruby_hash | @ruby_hash_pattern | @ruby_hash_splat_argument | @ruby_hash_splat_parameter | @ruby_heredoc_body | @ruby_if | @ruby_if_guard | @ruby_if_modifier | @ruby_in | @ruby_in_clause | @ruby_interpolation | @ruby_keyword_parameter | @ruby_keyword_pattern | @ruby_lambda | @ruby_lambda_parameters | @ruby_left_assignment_list | @ruby_match_pattern | @ruby_method | @ruby_method_parameters | @ruby_module | @ruby_next | @ruby_operator_assignment | @ruby_optional_parameter | @ruby_pair | @ruby_parenthesized_pattern | @ruby_parenthesized_statements | @ruby_pattern | @ruby_program | @ruby_range | @ruby_rational | @ruby_redo | @ruby_regex | @ruby_rescue | @ruby_rescue_modifier | @ruby_rest_assignment | @ruby_retry | @ruby_return | @ruby_right_assignment_list | @ruby_scope_resolution | @ruby_setter | @ruby_singleton_class | @ruby_singleton_method | @ruby_splat_argument | @ruby_splat_parameter | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_superclass | @ruby_symbol_array | @ruby_test_pattern | @ruby_then | @ruby_token | @ruby_unary | @ruby_undef | @ruby_unless | @ruby_unless_guard | @ruby_unless_modifier | @ruby_until | @ruby_until_modifier | @ruby_variable_reference_pattern | @ruby_when | @ruby_while | @ruby_while_modifier | @ruby_yield
+
+ruby_ast_node_location(
+  unique int node: @ruby_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+ruby_ast_node_parent(
+  unique int node: @ruby_ast_node ref,
+  int parent: @ruby_ast_node ref,
+  int parent_index: int ref
+);
+
+/*- Erb dbscheme -*/
+erb_comment_directive_child(
+  unique int erb_comment_directive: @erb_comment_directive ref,
+  unique int child: @erb_token_comment ref
+);
+
+erb_comment_directive_def(
+  unique int id: @erb_comment_directive
+);
+
+erb_directive_child(
+  unique int erb_directive: @erb_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_directive_def(
+  unique int id: @erb_directive
+);
+
+erb_graphql_directive_child(
+  unique int erb_graphql_directive: @erb_graphql_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_graphql_directive_def(
+  unique int id: @erb_graphql_directive
+);
+
+erb_output_directive_child(
+  unique int erb_output_directive: @erb_output_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_output_directive_def(
+  unique int id: @erb_output_directive
+);
+
+@erb_template_child_type = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_token_content
+
+#keyset[erb_template, index]
+erb_template_child(
+  int erb_template: @erb_template ref,
+  int index: int ref,
+  unique int child: @erb_template_child_type ref
+);
+
+erb_template_def(
+  unique int id: @erb_template
+);
+
+erb_tokeninfo(
+  unique int id: @erb_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @erb_token.kind of
+  0 = @erb_reserved_word
+| 1 = @erb_token_code
+| 2 = @erb_token_comment
+| 3 = @erb_token_content
+;
+
+
+@erb_ast_node = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_template | @erb_token
+
+erb_ast_node_location(
+  unique int node: @erb_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+erb_ast_node_parent(
+  unique int node: @erb_ast_node ref,
+  int parent: @erb_ast_node ref,
+  int parent_index: int ref
+);
+
diff --git a/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/upgrade.properties b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/upgrade.properties
new file mode 100644
index 00000000000..1d437ec8ac6
--- /dev/null
+++ b/ruby/downgrades/dc51d416301df12df5b70fbc4338de6cc1f82bfd/upgrade.properties
@@ -0,0 +1,3 @@
+description: Add databaseMetadata relation
+compatibility: full
+databaseMetadata.rel: delete
diff --git a/ruby/extractor/src/generator.rs b/ruby/extractor/src/generator.rs
index 00d878243ae..1601d2edda6 100644
--- a/ruby/extractor/src/generator.rs
+++ b/ruby/extractor/src/generator.rs
@@ -28,5 +28,5 @@ pub fn run(options: Options) -> std::io::Result<()> {
         },
     ];
 
-    generate(languages, options.dbscheme, options.library)
+    generate(languages, options.dbscheme, options.library, true)
 }
diff --git a/ruby/ql/lib/ruby.dbscheme b/ruby/ql/lib/ruby.dbscheme
index 40a6b0a5e81..dc51d416301 100644
--- a/ruby/ql/lib/ruby.dbscheme
+++ b/ruby/ql/lib/ruby.dbscheme
@@ -108,6 +108,12 @@ yaml_locations(unique int locatable: @yaml_locatable ref,
 
 @yaml_locatable = @yaml_node | @yaml_error;
 
+/*- Database metadata -*/
+databaseMetadata(
+  string metadataKey: string ref,
+  string value: string ref
+);
+
 /*- Ruby dbscheme -*/
 @ruby_underscore_arg = @ruby_assignment | @ruby_binary | @ruby_conditional | @ruby_operator_assignment | @ruby_range | @ruby_unary | @ruby_underscore_primary
 
diff --git a/ruby/ql/lib/ruby.dbscheme.stats b/ruby/ql/lib/ruby.dbscheme.stats
index fd8850293b4..74a9e97f4bd 100644
--- a/ruby/ql/lib/ruby.dbscheme.stats
+++ b/ruby/ql/lib/ruby.dbscheme.stats
@@ -21521,6 +21521,42 @@
                 </dep>
             </dependencies>
         </relation>
+        <relation>
+            <name>databaseMetadata</name>
+            <cardinality>1</cardinality>
+            <columnsizes>
+                <e>
+                    <k>metadataKey</k>
+                    <v>1</v>
+                </e>
+                <e>
+                    <k>value</k>
+                    <v>1</v>
+                </e>
+            </columnsizes>
+            <dependencies>
+                <dep>
+                    <src>metadataKey</src>
+                    <trg>value</trg>
+                    <val>
+                        <hist>
+                            <budget>12</budget>
+                            <bs/>
+                        </hist>
+                    </val>
+                </dep>
+                <dep>
+                    <src>value</src>
+                    <trg>metadataKey</trg>
+                    <val>
+                        <hist>
+                            <budget>12</budget>
+                            <bs/>
+                        </hist>
+                    </val>
+                </dep>
+            </dependencies>
+        </relation>
         <relation>
             <name>yaml_aliases</name>
             <cardinality>0</cardinality>
diff --git a/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/old.dbscheme b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/old.dbscheme
new file mode 100644
index 00000000000..40a6b0a5e81
--- /dev/null
+++ b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/old.dbscheme
@@ -0,0 +1,1526 @@
+// CodeQL database schema for Ruby
+// Automatically generated from the tree-sitter grammar; do not edit
+
+/*- Files and folders -*/
+
+/**
+ * The location of an element.
+ * The location spans column `startcolumn` of line `startline` to
+ * column `endcolumn` of line `endline` in file `file`.
+ * For more information, see
+ * [Locations](https://codeql.github.com/docs/writing-codeql-queries/providing-locations-in-codeql-queries/).
+ */
+locations_default(
+  unique int id: @location_default,
+  int file: @file ref,
+  int beginLine: int ref,
+  int beginColumn: int ref,
+  int endLine: int ref,
+  int endColumn: int ref
+);
+
+files(
+  unique int id: @file,
+  string name: string ref
+);
+
+folders(
+  unique int id: @folder,
+  string name: string ref
+);
+
+@container = @file | @folder
+
+containerparent(
+  int parent: @container ref,
+  unique int child: @container ref
+);
+
+/*- Empty location -*/
+
+empty_location(
+  int location: @location_default ref
+);
+
+/*- Source location prefix -*/
+
+/**
+ * The source location of the snapshot.
+ */
+sourceLocationPrefix(string prefix : string ref);
+
+/*- Diagnostic messages -*/
+
+diagnostics(
+  unique int id: @diagnostic,
+  int severity: int ref,
+  string error_tag: string ref,
+  string error_message: string ref,
+  string full_error_message: string ref,
+  int location: @location_default ref
+);
+
+/*- Diagnostic messages: severity -*/
+
+case @diagnostic.severity of
+  10 = @diagnostic_debug
+| 20 = @diagnostic_info
+| 30 = @diagnostic_warning
+| 40 = @diagnostic_error
+;
+
+/*- YAML -*/
+
+#keyset[parent, idx]
+yaml (unique int id: @yaml_node,
+      int kind: int ref,
+      int parent: @yaml_node_parent ref,
+      int idx: int ref,
+      string tag: string ref,
+      string tostring: string ref);
+
+case @yaml_node.kind of
+  0 = @yaml_scalar_node
+| 1 = @yaml_mapping_node
+| 2 = @yaml_sequence_node
+| 3 = @yaml_alias_node
+;
+
+@yaml_collection_node = @yaml_mapping_node | @yaml_sequence_node;
+
+@yaml_node_parent = @yaml_collection_node | @file;
+
+yaml_anchors (unique int node: @yaml_node ref,
+              string anchor: string ref);
+
+yaml_aliases (unique int alias: @yaml_alias_node ref,
+              string target: string ref);
+
+yaml_scalars (unique int scalar: @yaml_scalar_node ref,
+              int style: int ref,
+              string value: string ref);
+
+yaml_errors (unique int id: @yaml_error,
+             string message: string ref);
+
+yaml_locations(unique int locatable: @yaml_locatable ref,
+             int location: @location_default ref);
+
+@yaml_locatable = @yaml_node | @yaml_error;
+
+/*- Ruby dbscheme -*/
+@ruby_underscore_arg = @ruby_assignment | @ruby_binary | @ruby_conditional | @ruby_operator_assignment | @ruby_range | @ruby_unary | @ruby_underscore_primary
+
+@ruby_underscore_call_operator = @ruby_reserved_word
+
+@ruby_underscore_expression = @ruby_assignment | @ruby_binary | @ruby_break | @ruby_call | @ruby_match_pattern | @ruby_next | @ruby_operator_assignment | @ruby_return | @ruby_test_pattern | @ruby_unary | @ruby_underscore_arg | @ruby_yield
+
+@ruby_underscore_lhs = @ruby_call | @ruby_element_reference | @ruby_scope_resolution | @ruby_token_false | @ruby_token_nil | @ruby_token_true | @ruby_underscore_variable
+
+@ruby_underscore_method_name = @ruby_delimited_symbol | @ruby_setter | @ruby_token_constant | @ruby_token_identifier | @ruby_token_operator | @ruby_token_simple_symbol | @ruby_underscore_nonlocal_variable
+
+@ruby_underscore_nonlocal_variable = @ruby_token_class_variable | @ruby_token_global_variable | @ruby_token_instance_variable
+
+@ruby_underscore_pattern_constant = @ruby_scope_resolution | @ruby_token_constant
+
+@ruby_underscore_pattern_expr = @ruby_alternative_pattern | @ruby_as_pattern | @ruby_underscore_pattern_expr_basic
+
+@ruby_underscore_pattern_expr_basic = @ruby_array_pattern | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_parenthesized_pattern | @ruby_range | @ruby_token_identifier | @ruby_underscore_pattern_constant | @ruby_underscore_pattern_primitive | @ruby_variable_reference_pattern
+
+@ruby_underscore_pattern_primitive = @ruby_delimited_symbol | @ruby_lambda | @ruby_regex | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_encoding | @ruby_token_false | @ruby_token_file | @ruby_token_heredoc_beginning | @ruby_token_line | @ruby_token_nil | @ruby_token_self | @ruby_token_simple_symbol | @ruby_token_true | @ruby_unary | @ruby_underscore_simple_numeric
+
+@ruby_underscore_pattern_top_expr_body = @ruby_array_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_underscore_pattern_expr
+
+@ruby_underscore_primary = @ruby_array | @ruby_begin | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_delimited_symbol | @ruby_for | @ruby_hash | @ruby_if | @ruby_lambda | @ruby_method | @ruby_module | @ruby_next | @ruby_parenthesized_statements | @ruby_redo | @ruby_regex | @ruby_retry | @ruby_return | @ruby_singleton_class | @ruby_singleton_method | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_character | @ruby_token_heredoc_beginning | @ruby_token_simple_symbol | @ruby_unary | @ruby_underscore_lhs | @ruby_underscore_simple_numeric | @ruby_unless | @ruby_until | @ruby_while | @ruby_yield
+
+@ruby_underscore_simple_numeric = @ruby_complex | @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+@ruby_underscore_statement = @ruby_alias | @ruby_begin_block | @ruby_end_block | @ruby_if_modifier | @ruby_rescue_modifier | @ruby_undef | @ruby_underscore_expression | @ruby_unless_modifier | @ruby_until_modifier | @ruby_while_modifier
+
+@ruby_underscore_variable = @ruby_token_constant | @ruby_token_identifier | @ruby_token_self | @ruby_token_super | @ruby_underscore_nonlocal_variable
+
+ruby_alias_def(
+  unique int id: @ruby_alias,
+  int alias: @ruby_underscore_method_name ref,
+  int name: @ruby_underscore_method_name ref
+);
+
+#keyset[ruby_alternative_pattern, index]
+ruby_alternative_pattern_alternatives(
+  int ruby_alternative_pattern: @ruby_alternative_pattern ref,
+  int index: int ref,
+  unique int alternatives: @ruby_underscore_pattern_expr_basic ref
+);
+
+ruby_alternative_pattern_def(
+  unique int id: @ruby_alternative_pattern
+);
+
+@ruby_argument_list_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_argument_list, index]
+ruby_argument_list_child(
+  int ruby_argument_list: @ruby_argument_list ref,
+  int index: int ref,
+  unique int child: @ruby_argument_list_child_type ref
+);
+
+ruby_argument_list_def(
+  unique int id: @ruby_argument_list
+);
+
+@ruby_array_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_array, index]
+ruby_array_child(
+  int ruby_array: @ruby_array ref,
+  int index: int ref,
+  unique int child: @ruby_array_child_type ref
+);
+
+ruby_array_def(
+  unique int id: @ruby_array
+);
+
+ruby_array_pattern_class(
+  unique int ruby_array_pattern: @ruby_array_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_array_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_array_pattern, index]
+ruby_array_pattern_child(
+  int ruby_array_pattern: @ruby_array_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_array_pattern_child_type ref
+);
+
+ruby_array_pattern_def(
+  unique int id: @ruby_array_pattern
+);
+
+ruby_as_pattern_def(
+  unique int id: @ruby_as_pattern,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_assignment_left_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+@ruby_assignment_right_type = @ruby_rescue_modifier | @ruby_right_assignment_list | @ruby_splat_argument | @ruby_underscore_expression
+
+ruby_assignment_def(
+  unique int id: @ruby_assignment,
+  int left: @ruby_assignment_left_type ref,
+  int right: @ruby_assignment_right_type ref
+);
+
+@ruby_bare_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_string, index]
+ruby_bare_string_child(
+  int ruby_bare_string: @ruby_bare_string ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string_child_type ref
+);
+
+ruby_bare_string_def(
+  unique int id: @ruby_bare_string
+);
+
+@ruby_bare_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_symbol, index]
+ruby_bare_symbol_child(
+  int ruby_bare_symbol: @ruby_bare_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol_child_type ref
+);
+
+ruby_bare_symbol_def(
+  unique int id: @ruby_bare_symbol
+);
+
+@ruby_begin_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin, index]
+ruby_begin_child(
+  int ruby_begin: @ruby_begin ref,
+  int index: int ref,
+  unique int child: @ruby_begin_child_type ref
+);
+
+ruby_begin_def(
+  unique int id: @ruby_begin
+);
+
+@ruby_begin_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin_block, index]
+ruby_begin_block_child(
+  int ruby_begin_block: @ruby_begin_block ref,
+  int index: int ref,
+  unique int child: @ruby_begin_block_child_type ref
+);
+
+ruby_begin_block_def(
+  unique int id: @ruby_begin_block
+);
+
+@ruby_binary_left_type = @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_binary.operator of
+  0 = @ruby_binary_bangequal
+| 1 = @ruby_binary_bangtilde
+| 2 = @ruby_binary_percent
+| 3 = @ruby_binary_ampersand
+| 4 = @ruby_binary_ampersandampersand
+| 5 = @ruby_binary_star
+| 6 = @ruby_binary_starstar
+| 7 = @ruby_binary_plus
+| 8 = @ruby_binary_minus
+| 9 = @ruby_binary_slash
+| 10 = @ruby_binary_langle
+| 11 = @ruby_binary_langlelangle
+| 12 = @ruby_binary_langleequal
+| 13 = @ruby_binary_langleequalrangle
+| 14 = @ruby_binary_equalequal
+| 15 = @ruby_binary_equalequalequal
+| 16 = @ruby_binary_equaltilde
+| 17 = @ruby_binary_rangle
+| 18 = @ruby_binary_rangleequal
+| 19 = @ruby_binary_ranglerangle
+| 20 = @ruby_binary_caret
+| 21 = @ruby_binary_and
+| 22 = @ruby_binary_or
+| 23 = @ruby_binary_pipe
+| 24 = @ruby_binary_pipepipe
+;
+
+
+ruby_binary_def(
+  unique int id: @ruby_binary,
+  int left: @ruby_binary_left_type ref,
+  int operator: int ref,
+  int right: @ruby_underscore_expression ref
+);
+
+ruby_block_body(
+  unique int ruby_block: @ruby_block ref,
+  unique int body: @ruby_block_body ref
+);
+
+ruby_block_parameters(
+  unique int ruby_block: @ruby_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_block_def(
+  unique int id: @ruby_block
+);
+
+ruby_block_argument_child(
+  unique int ruby_block_argument: @ruby_block_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_block_argument_def(
+  unique int id: @ruby_block_argument
+);
+
+@ruby_block_body_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_block_body, index]
+ruby_block_body_child(
+  int ruby_block_body: @ruby_block_body ref,
+  int index: int ref,
+  unique int child: @ruby_block_body_child_type ref
+);
+
+ruby_block_body_def(
+  unique int id: @ruby_block_body
+);
+
+ruby_block_parameter_name(
+  unique int ruby_block_parameter: @ruby_block_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_block_parameter_def(
+  unique int id: @ruby_block_parameter
+);
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_locals(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int locals: @ruby_token_identifier ref
+);
+
+@ruby_block_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_child(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_block_parameters_child_type ref
+);
+
+ruby_block_parameters_def(
+  unique int id: @ruby_block_parameters
+);
+
+@ruby_body_statement_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_body_statement, index]
+ruby_body_statement_child(
+  int ruby_body_statement: @ruby_body_statement ref,
+  int index: int ref,
+  unique int child: @ruby_body_statement_child_type ref
+);
+
+ruby_body_statement_def(
+  unique int id: @ruby_body_statement
+);
+
+ruby_break_child(
+  unique int ruby_break: @ruby_break ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_break_def(
+  unique int id: @ruby_break
+);
+
+ruby_call_arguments(
+  unique int ruby_call: @ruby_call ref,
+  unique int arguments: @ruby_argument_list ref
+);
+
+@ruby_call_block_type = @ruby_block | @ruby_do_block
+
+ruby_call_block(
+  unique int ruby_call: @ruby_call ref,
+  unique int block: @ruby_call_block_type ref
+);
+
+@ruby_call_method_type = @ruby_token_operator | @ruby_underscore_variable
+
+ruby_call_method(
+  unique int ruby_call: @ruby_call ref,
+  unique int method: @ruby_call_method_type ref
+);
+
+ruby_call_operator(
+  unique int ruby_call: @ruby_call ref,
+  unique int operator: @ruby_underscore_call_operator ref
+);
+
+ruby_call_receiver(
+  unique int ruby_call: @ruby_call ref,
+  unique int receiver: @ruby_underscore_primary ref
+);
+
+ruby_call_def(
+  unique int id: @ruby_call
+);
+
+ruby_case_value(
+  unique int ruby_case__: @ruby_case__ ref,
+  unique int value: @ruby_underscore_statement ref
+);
+
+@ruby_case_child_type = @ruby_else | @ruby_when
+
+#keyset[ruby_case__, index]
+ruby_case_child(
+  int ruby_case__: @ruby_case__ ref,
+  int index: int ref,
+  unique int child: @ruby_case_child_type ref
+);
+
+ruby_case_def(
+  unique int id: @ruby_case__
+);
+
+#keyset[ruby_case_match, index]
+ruby_case_match_clauses(
+  int ruby_case_match: @ruby_case_match ref,
+  int index: int ref,
+  unique int clauses: @ruby_in_clause ref
+);
+
+ruby_case_match_else(
+  unique int ruby_case_match: @ruby_case_match ref,
+  unique int else: @ruby_else ref
+);
+
+ruby_case_match_def(
+  unique int id: @ruby_case_match,
+  int value: @ruby_underscore_statement ref
+);
+
+#keyset[ruby_chained_string, index]
+ruby_chained_string_child(
+  int ruby_chained_string: @ruby_chained_string ref,
+  int index: int ref,
+  unique int child: @ruby_string__ ref
+);
+
+ruby_chained_string_def(
+  unique int id: @ruby_chained_string
+);
+
+ruby_class_body(
+  unique int ruby_class: @ruby_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_class_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_class_superclass(
+  unique int ruby_class: @ruby_class ref,
+  unique int superclass: @ruby_superclass ref
+);
+
+ruby_class_def(
+  unique int id: @ruby_class,
+  int name: @ruby_class_name_type ref
+);
+
+@ruby_complex_child_type = @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+ruby_complex_def(
+  unique int id: @ruby_complex,
+  int child: @ruby_complex_child_type ref
+);
+
+ruby_conditional_def(
+  unique int id: @ruby_conditional,
+  int alternative: @ruby_underscore_arg ref,
+  int condition: @ruby_underscore_arg ref,
+  int consequence: @ruby_underscore_arg ref
+);
+
+@ruby_delimited_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_delimited_symbol, index]
+ruby_delimited_symbol_child(
+  int ruby_delimited_symbol: @ruby_delimited_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_delimited_symbol_child_type ref
+);
+
+ruby_delimited_symbol_def(
+  unique int id: @ruby_delimited_symbol
+);
+
+@ruby_destructured_left_assignment_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_destructured_left_assignment, index]
+ruby_destructured_left_assignment_child(
+  int ruby_destructured_left_assignment: @ruby_destructured_left_assignment ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_left_assignment_child_type ref
+);
+
+ruby_destructured_left_assignment_def(
+  unique int id: @ruby_destructured_left_assignment
+);
+
+@ruby_destructured_parameter_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_destructured_parameter, index]
+ruby_destructured_parameter_child(
+  int ruby_destructured_parameter: @ruby_destructured_parameter ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_parameter_child_type ref
+);
+
+ruby_destructured_parameter_def(
+  unique int id: @ruby_destructured_parameter
+);
+
+@ruby_do_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_do, index]
+ruby_do_child(
+  int ruby_do: @ruby_do ref,
+  int index: int ref,
+  unique int child: @ruby_do_child_type ref
+);
+
+ruby_do_def(
+  unique int id: @ruby_do
+);
+
+ruby_do_block_body(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_do_block_parameters(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_do_block_def(
+  unique int id: @ruby_do_block
+);
+
+@ruby_element_reference_block_type = @ruby_block | @ruby_do_block
+
+ruby_element_reference_block(
+  unique int ruby_element_reference: @ruby_element_reference ref,
+  unique int block: @ruby_element_reference_block_type ref
+);
+
+@ruby_element_reference_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_element_reference, index]
+ruby_element_reference_child(
+  int ruby_element_reference: @ruby_element_reference ref,
+  int index: int ref,
+  unique int child: @ruby_element_reference_child_type ref
+);
+
+ruby_element_reference_def(
+  unique int id: @ruby_element_reference,
+  int object: @ruby_underscore_primary ref
+);
+
+@ruby_else_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_else, index]
+ruby_else_child(
+  int ruby_else: @ruby_else ref,
+  int index: int ref,
+  unique int child: @ruby_else_child_type ref
+);
+
+ruby_else_def(
+  unique int id: @ruby_else
+);
+
+@ruby_elsif_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_elsif_alternative(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int alternative: @ruby_elsif_alternative_type ref
+);
+
+ruby_elsif_consequence(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_elsif_def(
+  unique int id: @ruby_elsif,
+  int condition: @ruby_underscore_statement ref
+);
+
+@ruby_end_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_end_block, index]
+ruby_end_block_child(
+  int ruby_end_block: @ruby_end_block ref,
+  int index: int ref,
+  unique int child: @ruby_end_block_child_type ref
+);
+
+ruby_end_block_def(
+  unique int id: @ruby_end_block
+);
+
+@ruby_ensure_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_ensure, index]
+ruby_ensure_child(
+  int ruby_ensure: @ruby_ensure ref,
+  int index: int ref,
+  unique int child: @ruby_ensure_child_type ref
+);
+
+ruby_ensure_def(
+  unique int id: @ruby_ensure
+);
+
+ruby_exception_variable_def(
+  unique int id: @ruby_exception_variable,
+  int child: @ruby_underscore_lhs ref
+);
+
+@ruby_exceptions_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_exceptions, index]
+ruby_exceptions_child(
+  int ruby_exceptions: @ruby_exceptions ref,
+  int index: int ref,
+  unique int child: @ruby_exceptions_child_type ref
+);
+
+ruby_exceptions_def(
+  unique int id: @ruby_exceptions
+);
+
+ruby_expression_reference_pattern_def(
+  unique int id: @ruby_expression_reference_pattern,
+  int value: @ruby_underscore_expression ref
+);
+
+ruby_find_pattern_class(
+  unique int ruby_find_pattern: @ruby_find_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_find_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_find_pattern, index]
+ruby_find_pattern_child(
+  int ruby_find_pattern: @ruby_find_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_find_pattern_child_type ref
+);
+
+ruby_find_pattern_def(
+  unique int id: @ruby_find_pattern
+);
+
+@ruby_for_pattern_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+ruby_for_def(
+  unique int id: @ruby_for,
+  int body: @ruby_do ref,
+  int pattern: @ruby_for_pattern_type ref,
+  int value: @ruby_in ref
+);
+
+@ruby_hash_child_type = @ruby_hash_splat_argument | @ruby_pair
+
+#keyset[ruby_hash, index]
+ruby_hash_child(
+  int ruby_hash: @ruby_hash ref,
+  int index: int ref,
+  unique int child: @ruby_hash_child_type ref
+);
+
+ruby_hash_def(
+  unique int id: @ruby_hash
+);
+
+ruby_hash_pattern_class(
+  unique int ruby_hash_pattern: @ruby_hash_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_hash_pattern_child_type = @ruby_hash_splat_parameter | @ruby_keyword_pattern | @ruby_token_hash_splat_nil
+
+#keyset[ruby_hash_pattern, index]
+ruby_hash_pattern_child(
+  int ruby_hash_pattern: @ruby_hash_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_hash_pattern_child_type ref
+);
+
+ruby_hash_pattern_def(
+  unique int id: @ruby_hash_pattern
+);
+
+ruby_hash_splat_argument_child(
+  unique int ruby_hash_splat_argument: @ruby_hash_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_hash_splat_argument_def(
+  unique int id: @ruby_hash_splat_argument
+);
+
+ruby_hash_splat_parameter_name(
+  unique int ruby_hash_splat_parameter: @ruby_hash_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_hash_splat_parameter_def(
+  unique int id: @ruby_hash_splat_parameter
+);
+
+@ruby_heredoc_body_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_heredoc_content | @ruby_token_heredoc_end
+
+#keyset[ruby_heredoc_body, index]
+ruby_heredoc_body_child(
+  int ruby_heredoc_body: @ruby_heredoc_body ref,
+  int index: int ref,
+  unique int child: @ruby_heredoc_body_child_type ref
+);
+
+ruby_heredoc_body_def(
+  unique int id: @ruby_heredoc_body
+);
+
+@ruby_if_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_if_alternative(
+  unique int ruby_if: @ruby_if ref,
+  unique int alternative: @ruby_if_alternative_type ref
+);
+
+ruby_if_consequence(
+  unique int ruby_if: @ruby_if ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_if_def(
+  unique int id: @ruby_if,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_if_guard_def(
+  unique int id: @ruby_if_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_if_modifier_def(
+  unique int id: @ruby_if_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_in_def(
+  unique int id: @ruby_in,
+  int child: @ruby_underscore_arg ref
+);
+
+ruby_in_clause_body(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int body: @ruby_then ref
+);
+
+@ruby_in_clause_guard_type = @ruby_if_guard | @ruby_unless_guard
+
+ruby_in_clause_guard(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int guard: @ruby_in_clause_guard_type ref
+);
+
+ruby_in_clause_def(
+  unique int id: @ruby_in_clause,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref
+);
+
+@ruby_interpolation_child_type = @ruby_token_empty_statement | @ruby_underscore_nonlocal_variable | @ruby_underscore_statement
+
+#keyset[ruby_interpolation, index]
+ruby_interpolation_child(
+  int ruby_interpolation: @ruby_interpolation ref,
+  int index: int ref,
+  unique int child: @ruby_interpolation_child_type ref
+);
+
+ruby_interpolation_def(
+  unique int id: @ruby_interpolation
+);
+
+ruby_keyword_parameter_value(
+  unique int ruby_keyword_parameter: @ruby_keyword_parameter ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_keyword_parameter_def(
+  unique int id: @ruby_keyword_parameter,
+  int name: @ruby_token_identifier ref
+);
+
+@ruby_keyword_pattern_key_type = @ruby_string__ | @ruby_token_hash_key_symbol
+
+ruby_keyword_pattern_value(
+  unique int ruby_keyword_pattern: @ruby_keyword_pattern ref,
+  unique int value: @ruby_underscore_pattern_expr ref
+);
+
+ruby_keyword_pattern_def(
+  unique int id: @ruby_keyword_pattern,
+  int key__: @ruby_keyword_pattern_key_type ref
+);
+
+@ruby_lambda_body_type = @ruby_block | @ruby_do_block
+
+ruby_lambda_parameters(
+  unique int ruby_lambda: @ruby_lambda ref,
+  unique int parameters: @ruby_lambda_parameters ref
+);
+
+ruby_lambda_def(
+  unique int id: @ruby_lambda,
+  int body: @ruby_lambda_body_type ref
+);
+
+@ruby_lambda_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_lambda_parameters, index]
+ruby_lambda_parameters_child(
+  int ruby_lambda_parameters: @ruby_lambda_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_lambda_parameters_child_type ref
+);
+
+ruby_lambda_parameters_def(
+  unique int id: @ruby_lambda_parameters
+);
+
+@ruby_left_assignment_list_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_left_assignment_list, index]
+ruby_left_assignment_list_child(
+  int ruby_left_assignment_list: @ruby_left_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_left_assignment_list_child_type ref
+);
+
+ruby_left_assignment_list_def(
+  unique int id: @ruby_left_assignment_list
+);
+
+ruby_match_pattern_def(
+  unique int id: @ruby_match_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_method_body(
+  unique int ruby_method: @ruby_method ref,
+  unique int body: @ruby_method_body_type ref
+);
+
+ruby_method_parameters(
+  unique int ruby_method: @ruby_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_method_def(
+  unique int id: @ruby_method,
+  int name: @ruby_underscore_method_name ref
+);
+
+@ruby_method_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_method_parameters, index]
+ruby_method_parameters_child(
+  int ruby_method_parameters: @ruby_method_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_method_parameters_child_type ref
+);
+
+ruby_method_parameters_def(
+  unique int id: @ruby_method_parameters
+);
+
+ruby_module_body(
+  unique int ruby_module: @ruby_module ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_module_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_module_def(
+  unique int id: @ruby_module,
+  int name: @ruby_module_name_type ref
+);
+
+ruby_next_child(
+  unique int ruby_next: @ruby_next ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_next_def(
+  unique int id: @ruby_next
+);
+
+case @ruby_operator_assignment.operator of
+  0 = @ruby_operator_assignment_percentequal
+| 1 = @ruby_operator_assignment_ampersandampersandequal
+| 2 = @ruby_operator_assignment_ampersandequal
+| 3 = @ruby_operator_assignment_starstarequal
+| 4 = @ruby_operator_assignment_starequal
+| 5 = @ruby_operator_assignment_plusequal
+| 6 = @ruby_operator_assignment_minusequal
+| 7 = @ruby_operator_assignment_slashequal
+| 8 = @ruby_operator_assignment_langlelangleequal
+| 9 = @ruby_operator_assignment_ranglerangleequal
+| 10 = @ruby_operator_assignment_caretequal
+| 11 = @ruby_operator_assignment_pipeequal
+| 12 = @ruby_operator_assignment_pipepipeequal
+;
+
+
+@ruby_operator_assignment_right_type = @ruby_rescue_modifier | @ruby_underscore_expression
+
+ruby_operator_assignment_def(
+  unique int id: @ruby_operator_assignment,
+  int left: @ruby_underscore_lhs ref,
+  int operator: int ref,
+  int right: @ruby_operator_assignment_right_type ref
+);
+
+ruby_optional_parameter_def(
+  unique int id: @ruby_optional_parameter,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_pair_key_type = @ruby_string__ | @ruby_token_hash_key_symbol | @ruby_underscore_arg
+
+ruby_pair_value(
+  unique int ruby_pair: @ruby_pair ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_pair_def(
+  unique int id: @ruby_pair,
+  int key__: @ruby_pair_key_type ref
+);
+
+ruby_parenthesized_pattern_def(
+  unique int id: @ruby_parenthesized_pattern,
+  int child: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_parenthesized_statements_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_parenthesized_statements, index]
+ruby_parenthesized_statements_child(
+  int ruby_parenthesized_statements: @ruby_parenthesized_statements ref,
+  int index: int ref,
+  unique int child: @ruby_parenthesized_statements_child_type ref
+);
+
+ruby_parenthesized_statements_def(
+  unique int id: @ruby_parenthesized_statements
+);
+
+@ruby_pattern_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+ruby_pattern_def(
+  unique int id: @ruby_pattern,
+  int child: @ruby_pattern_child_type ref
+);
+
+@ruby_program_child_type = @ruby_token_empty_statement | @ruby_token_uninterpreted | @ruby_underscore_statement
+
+#keyset[ruby_program, index]
+ruby_program_child(
+  int ruby_program: @ruby_program ref,
+  int index: int ref,
+  unique int child: @ruby_program_child_type ref
+);
+
+ruby_program_def(
+  unique int id: @ruby_program
+);
+
+@ruby_range_begin_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_begin(
+  unique int ruby_range: @ruby_range ref,
+  unique int begin: @ruby_range_begin_type ref
+);
+
+@ruby_range_end_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_end(
+  unique int ruby_range: @ruby_range ref,
+  unique int end: @ruby_range_end_type ref
+);
+
+case @ruby_range.operator of
+  0 = @ruby_range_dotdot
+| 1 = @ruby_range_dotdotdot
+;
+
+
+ruby_range_def(
+  unique int id: @ruby_range,
+  int operator: int ref
+);
+
+@ruby_rational_child_type = @ruby_token_float | @ruby_token_integer
+
+ruby_rational_def(
+  unique int id: @ruby_rational,
+  int child: @ruby_rational_child_type ref
+);
+
+ruby_redo_child(
+  unique int ruby_redo: @ruby_redo ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_redo_def(
+  unique int id: @ruby_redo
+);
+
+@ruby_regex_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_regex, index]
+ruby_regex_child(
+  int ruby_regex: @ruby_regex ref,
+  int index: int ref,
+  unique int child: @ruby_regex_child_type ref
+);
+
+ruby_regex_def(
+  unique int id: @ruby_regex
+);
+
+ruby_rescue_body(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int body: @ruby_then ref
+);
+
+ruby_rescue_exceptions(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int exceptions: @ruby_exceptions ref
+);
+
+ruby_rescue_variable(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int variable: @ruby_exception_variable ref
+);
+
+ruby_rescue_def(
+  unique int id: @ruby_rescue
+);
+
+@ruby_rescue_modifier_body_type = @ruby_underscore_arg | @ruby_underscore_statement
+
+ruby_rescue_modifier_def(
+  unique int id: @ruby_rescue_modifier,
+  int body: @ruby_rescue_modifier_body_type ref,
+  int handler: @ruby_underscore_expression ref
+);
+
+ruby_rest_assignment_child(
+  unique int ruby_rest_assignment: @ruby_rest_assignment ref,
+  unique int child: @ruby_underscore_lhs ref
+);
+
+ruby_rest_assignment_def(
+  unique int id: @ruby_rest_assignment
+);
+
+ruby_retry_child(
+  unique int ruby_retry: @ruby_retry ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_retry_def(
+  unique int id: @ruby_retry
+);
+
+ruby_return_child(
+  unique int ruby_return: @ruby_return ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_return_def(
+  unique int id: @ruby_return
+);
+
+@ruby_right_assignment_list_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_right_assignment_list, index]
+ruby_right_assignment_list_child(
+  int ruby_right_assignment_list: @ruby_right_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_right_assignment_list_child_type ref
+);
+
+ruby_right_assignment_list_def(
+  unique int id: @ruby_right_assignment_list
+);
+
+@ruby_scope_resolution_scope_type = @ruby_underscore_pattern_constant | @ruby_underscore_primary
+
+ruby_scope_resolution_scope(
+  unique int ruby_scope_resolution: @ruby_scope_resolution ref,
+  unique int scope: @ruby_scope_resolution_scope_type ref
+);
+
+ruby_scope_resolution_def(
+  unique int id: @ruby_scope_resolution,
+  int name: @ruby_token_constant ref
+);
+
+ruby_setter_def(
+  unique int id: @ruby_setter,
+  int name: @ruby_token_identifier ref
+);
+
+ruby_singleton_class_body(
+  unique int ruby_singleton_class: @ruby_singleton_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_singleton_class_def(
+  unique int id: @ruby_singleton_class,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_singleton_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_singleton_method_body(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int body: @ruby_singleton_method_body_type ref
+);
+
+@ruby_singleton_method_object_type = @ruby_underscore_arg | @ruby_underscore_variable
+
+ruby_singleton_method_parameters(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_singleton_method_def(
+  unique int id: @ruby_singleton_method,
+  int name: @ruby_underscore_method_name ref,
+  int object: @ruby_singleton_method_object_type ref
+);
+
+ruby_splat_argument_child(
+  unique int ruby_splat_argument: @ruby_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_splat_argument_def(
+  unique int id: @ruby_splat_argument
+);
+
+ruby_splat_parameter_name(
+  unique int ruby_splat_parameter: @ruby_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_splat_parameter_def(
+  unique int id: @ruby_splat_parameter
+);
+
+@ruby_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_string__, index]
+ruby_string_child(
+  int ruby_string__: @ruby_string__ ref,
+  int index: int ref,
+  unique int child: @ruby_string_child_type ref
+);
+
+ruby_string_def(
+  unique int id: @ruby_string__
+);
+
+#keyset[ruby_string_array, index]
+ruby_string_array_child(
+  int ruby_string_array: @ruby_string_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string ref
+);
+
+ruby_string_array_def(
+  unique int id: @ruby_string_array
+);
+
+@ruby_subshell_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_subshell, index]
+ruby_subshell_child(
+  int ruby_subshell: @ruby_subshell ref,
+  int index: int ref,
+  unique int child: @ruby_subshell_child_type ref
+);
+
+ruby_subshell_def(
+  unique int id: @ruby_subshell
+);
+
+ruby_superclass_def(
+  unique int id: @ruby_superclass,
+  int child: @ruby_underscore_expression ref
+);
+
+#keyset[ruby_symbol_array, index]
+ruby_symbol_array_child(
+  int ruby_symbol_array: @ruby_symbol_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol ref
+);
+
+ruby_symbol_array_def(
+  unique int id: @ruby_symbol_array
+);
+
+ruby_test_pattern_def(
+  unique int id: @ruby_test_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_then_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_then, index]
+ruby_then_child(
+  int ruby_then: @ruby_then ref,
+  int index: int ref,
+  unique int child: @ruby_then_child_type ref
+);
+
+ruby_then_def(
+  unique int id: @ruby_then
+);
+
+@ruby_unary_operand_type = @ruby_parenthesized_statements | @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_unary.operator of
+  0 = @ruby_unary_bang
+| 1 = @ruby_unary_plus
+| 2 = @ruby_unary_minus
+| 3 = @ruby_unary_definedquestion
+| 4 = @ruby_unary_not
+| 5 = @ruby_unary_tilde
+;
+
+
+ruby_unary_def(
+  unique int id: @ruby_unary,
+  int operand: @ruby_unary_operand_type ref,
+  int operator: int ref
+);
+
+#keyset[ruby_undef, index]
+ruby_undef_child(
+  int ruby_undef: @ruby_undef ref,
+  int index: int ref,
+  unique int child: @ruby_underscore_method_name ref
+);
+
+ruby_undef_def(
+  unique int id: @ruby_undef
+);
+
+@ruby_unless_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_unless_alternative(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int alternative: @ruby_unless_alternative_type ref
+);
+
+ruby_unless_consequence(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_unless_def(
+  unique int id: @ruby_unless,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_unless_guard_def(
+  unique int id: @ruby_unless_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_unless_modifier_def(
+  unique int id: @ruby_unless_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_until_def(
+  unique int id: @ruby_until,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_until_modifier_def(
+  unique int id: @ruby_until_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+@ruby_variable_reference_pattern_name_type = @ruby_token_identifier | @ruby_underscore_nonlocal_variable
+
+ruby_variable_reference_pattern_def(
+  unique int id: @ruby_variable_reference_pattern,
+  int name: @ruby_variable_reference_pattern_name_type ref
+);
+
+ruby_when_body(
+  unique int ruby_when: @ruby_when ref,
+  unique int body: @ruby_then ref
+);
+
+#keyset[ruby_when, index]
+ruby_when_pattern(
+  int ruby_when: @ruby_when ref,
+  int index: int ref,
+  unique int pattern: @ruby_pattern ref
+);
+
+ruby_when_def(
+  unique int id: @ruby_when
+);
+
+ruby_while_def(
+  unique int id: @ruby_while,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_while_modifier_def(
+  unique int id: @ruby_while_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_yield_child(
+  unique int ruby_yield: @ruby_yield ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_yield_def(
+  unique int id: @ruby_yield
+);
+
+ruby_tokeninfo(
+  unique int id: @ruby_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @ruby_token.kind of
+  0 = @ruby_reserved_word
+| 1 = @ruby_token_character
+| 2 = @ruby_token_class_variable
+| 3 = @ruby_token_comment
+| 4 = @ruby_token_constant
+| 5 = @ruby_token_empty_statement
+| 6 = @ruby_token_encoding
+| 7 = @ruby_token_escape_sequence
+| 8 = @ruby_token_false
+| 9 = @ruby_token_file
+| 10 = @ruby_token_float
+| 11 = @ruby_token_forward_argument
+| 12 = @ruby_token_forward_parameter
+| 13 = @ruby_token_global_variable
+| 14 = @ruby_token_hash_key_symbol
+| 15 = @ruby_token_hash_splat_nil
+| 16 = @ruby_token_heredoc_beginning
+| 17 = @ruby_token_heredoc_content
+| 18 = @ruby_token_heredoc_end
+| 19 = @ruby_token_identifier
+| 20 = @ruby_token_instance_variable
+| 21 = @ruby_token_integer
+| 22 = @ruby_token_line
+| 23 = @ruby_token_nil
+| 24 = @ruby_token_operator
+| 25 = @ruby_token_self
+| 26 = @ruby_token_simple_symbol
+| 27 = @ruby_token_string_content
+| 28 = @ruby_token_super
+| 29 = @ruby_token_true
+| 30 = @ruby_token_uninterpreted
+;
+
+
+@ruby_ast_node = @ruby_alias | @ruby_alternative_pattern | @ruby_argument_list | @ruby_array | @ruby_array_pattern | @ruby_as_pattern | @ruby_assignment | @ruby_bare_string | @ruby_bare_symbol | @ruby_begin | @ruby_begin_block | @ruby_binary | @ruby_block | @ruby_block_argument | @ruby_block_body | @ruby_block_parameter | @ruby_block_parameters | @ruby_body_statement | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_complex | @ruby_conditional | @ruby_delimited_symbol | @ruby_destructured_left_assignment | @ruby_destructured_parameter | @ruby_do | @ruby_do_block | @ruby_element_reference | @ruby_else | @ruby_elsif | @ruby_end_block | @ruby_ensure | @ruby_exception_variable | @ruby_exceptions | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_for | @ruby_hash | @ruby_hash_pattern | @ruby_hash_splat_argument | @ruby_hash_splat_parameter | @ruby_heredoc_body | @ruby_if | @ruby_if_guard | @ruby_if_modifier | @ruby_in | @ruby_in_clause | @ruby_interpolation | @ruby_keyword_parameter | @ruby_keyword_pattern | @ruby_lambda | @ruby_lambda_parameters | @ruby_left_assignment_list | @ruby_match_pattern | @ruby_method | @ruby_method_parameters | @ruby_module | @ruby_next | @ruby_operator_assignment | @ruby_optional_parameter | @ruby_pair | @ruby_parenthesized_pattern | @ruby_parenthesized_statements | @ruby_pattern | @ruby_program | @ruby_range | @ruby_rational | @ruby_redo | @ruby_regex | @ruby_rescue | @ruby_rescue_modifier | @ruby_rest_assignment | @ruby_retry | @ruby_return | @ruby_right_assignment_list | @ruby_scope_resolution | @ruby_setter | @ruby_singleton_class | @ruby_singleton_method | @ruby_splat_argument | @ruby_splat_parameter | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_superclass | @ruby_symbol_array | @ruby_test_pattern | @ruby_then | @ruby_token | @ruby_unary | @ruby_undef | @ruby_unless | @ruby_unless_guard | @ruby_unless_modifier | @ruby_until | @ruby_until_modifier | @ruby_variable_reference_pattern | @ruby_when | @ruby_while | @ruby_while_modifier | @ruby_yield
+
+ruby_ast_node_location(
+  unique int node: @ruby_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+ruby_ast_node_parent(
+  unique int node: @ruby_ast_node ref,
+  int parent: @ruby_ast_node ref,
+  int parent_index: int ref
+);
+
+/*- Erb dbscheme -*/
+erb_comment_directive_child(
+  unique int erb_comment_directive: @erb_comment_directive ref,
+  unique int child: @erb_token_comment ref
+);
+
+erb_comment_directive_def(
+  unique int id: @erb_comment_directive
+);
+
+erb_directive_child(
+  unique int erb_directive: @erb_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_directive_def(
+  unique int id: @erb_directive
+);
+
+erb_graphql_directive_child(
+  unique int erb_graphql_directive: @erb_graphql_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_graphql_directive_def(
+  unique int id: @erb_graphql_directive
+);
+
+erb_output_directive_child(
+  unique int erb_output_directive: @erb_output_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_output_directive_def(
+  unique int id: @erb_output_directive
+);
+
+@erb_template_child_type = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_token_content
+
+#keyset[erb_template, index]
+erb_template_child(
+  int erb_template: @erb_template ref,
+  int index: int ref,
+  unique int child: @erb_template_child_type ref
+);
+
+erb_template_def(
+  unique int id: @erb_template
+);
+
+erb_tokeninfo(
+  unique int id: @erb_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @erb_token.kind of
+  0 = @erb_reserved_word
+| 1 = @erb_token_code
+| 2 = @erb_token_comment
+| 3 = @erb_token_content
+;
+
+
+@erb_ast_node = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_template | @erb_token
+
+erb_ast_node_location(
+  unique int node: @erb_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+erb_ast_node_parent(
+  unique int node: @erb_ast_node ref,
+  int parent: @erb_ast_node ref,
+  int parent_index: int ref
+);
+
diff --git a/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/ruby.dbscheme b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/ruby.dbscheme
new file mode 100644
index 00000000000..dc51d416301
--- /dev/null
+++ b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/ruby.dbscheme
@@ -0,0 +1,1532 @@
+// CodeQL database schema for Ruby
+// Automatically generated from the tree-sitter grammar; do not edit
+
+/*- Files and folders -*/
+
+/**
+ * The location of an element.
+ * The location spans column `startcolumn` of line `startline` to
+ * column `endcolumn` of line `endline` in file `file`.
+ * For more information, see
+ * [Locations](https://codeql.github.com/docs/writing-codeql-queries/providing-locations-in-codeql-queries/).
+ */
+locations_default(
+  unique int id: @location_default,
+  int file: @file ref,
+  int beginLine: int ref,
+  int beginColumn: int ref,
+  int endLine: int ref,
+  int endColumn: int ref
+);
+
+files(
+  unique int id: @file,
+  string name: string ref
+);
+
+folders(
+  unique int id: @folder,
+  string name: string ref
+);
+
+@container = @file | @folder
+
+containerparent(
+  int parent: @container ref,
+  unique int child: @container ref
+);
+
+/*- Empty location -*/
+
+empty_location(
+  int location: @location_default ref
+);
+
+/*- Source location prefix -*/
+
+/**
+ * The source location of the snapshot.
+ */
+sourceLocationPrefix(string prefix : string ref);
+
+/*- Diagnostic messages -*/
+
+diagnostics(
+  unique int id: @diagnostic,
+  int severity: int ref,
+  string error_tag: string ref,
+  string error_message: string ref,
+  string full_error_message: string ref,
+  int location: @location_default ref
+);
+
+/*- Diagnostic messages: severity -*/
+
+case @diagnostic.severity of
+  10 = @diagnostic_debug
+| 20 = @diagnostic_info
+| 30 = @diagnostic_warning
+| 40 = @diagnostic_error
+;
+
+/*- YAML -*/
+
+#keyset[parent, idx]
+yaml (unique int id: @yaml_node,
+      int kind: int ref,
+      int parent: @yaml_node_parent ref,
+      int idx: int ref,
+      string tag: string ref,
+      string tostring: string ref);
+
+case @yaml_node.kind of
+  0 = @yaml_scalar_node
+| 1 = @yaml_mapping_node
+| 2 = @yaml_sequence_node
+| 3 = @yaml_alias_node
+;
+
+@yaml_collection_node = @yaml_mapping_node | @yaml_sequence_node;
+
+@yaml_node_parent = @yaml_collection_node | @file;
+
+yaml_anchors (unique int node: @yaml_node ref,
+              string anchor: string ref);
+
+yaml_aliases (unique int alias: @yaml_alias_node ref,
+              string target: string ref);
+
+yaml_scalars (unique int scalar: @yaml_scalar_node ref,
+              int style: int ref,
+              string value: string ref);
+
+yaml_errors (unique int id: @yaml_error,
+             string message: string ref);
+
+yaml_locations(unique int locatable: @yaml_locatable ref,
+             int location: @location_default ref);
+
+@yaml_locatable = @yaml_node | @yaml_error;
+
+/*- Database metadata -*/
+databaseMetadata(
+  string metadataKey: string ref,
+  string value: string ref
+);
+
+/*- Ruby dbscheme -*/
+@ruby_underscore_arg = @ruby_assignment | @ruby_binary | @ruby_conditional | @ruby_operator_assignment | @ruby_range | @ruby_unary | @ruby_underscore_primary
+
+@ruby_underscore_call_operator = @ruby_reserved_word
+
+@ruby_underscore_expression = @ruby_assignment | @ruby_binary | @ruby_break | @ruby_call | @ruby_match_pattern | @ruby_next | @ruby_operator_assignment | @ruby_return | @ruby_test_pattern | @ruby_unary | @ruby_underscore_arg | @ruby_yield
+
+@ruby_underscore_lhs = @ruby_call | @ruby_element_reference | @ruby_scope_resolution | @ruby_token_false | @ruby_token_nil | @ruby_token_true | @ruby_underscore_variable
+
+@ruby_underscore_method_name = @ruby_delimited_symbol | @ruby_setter | @ruby_token_constant | @ruby_token_identifier | @ruby_token_operator | @ruby_token_simple_symbol | @ruby_underscore_nonlocal_variable
+
+@ruby_underscore_nonlocal_variable = @ruby_token_class_variable | @ruby_token_global_variable | @ruby_token_instance_variable
+
+@ruby_underscore_pattern_constant = @ruby_scope_resolution | @ruby_token_constant
+
+@ruby_underscore_pattern_expr = @ruby_alternative_pattern | @ruby_as_pattern | @ruby_underscore_pattern_expr_basic
+
+@ruby_underscore_pattern_expr_basic = @ruby_array_pattern | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_parenthesized_pattern | @ruby_range | @ruby_token_identifier | @ruby_underscore_pattern_constant | @ruby_underscore_pattern_primitive | @ruby_variable_reference_pattern
+
+@ruby_underscore_pattern_primitive = @ruby_delimited_symbol | @ruby_lambda | @ruby_regex | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_encoding | @ruby_token_false | @ruby_token_file | @ruby_token_heredoc_beginning | @ruby_token_line | @ruby_token_nil | @ruby_token_self | @ruby_token_simple_symbol | @ruby_token_true | @ruby_unary | @ruby_underscore_simple_numeric
+
+@ruby_underscore_pattern_top_expr_body = @ruby_array_pattern | @ruby_find_pattern | @ruby_hash_pattern | @ruby_underscore_pattern_expr
+
+@ruby_underscore_primary = @ruby_array | @ruby_begin | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_delimited_symbol | @ruby_for | @ruby_hash | @ruby_if | @ruby_lambda | @ruby_method | @ruby_module | @ruby_next | @ruby_parenthesized_statements | @ruby_redo | @ruby_regex | @ruby_retry | @ruby_return | @ruby_singleton_class | @ruby_singleton_method | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_symbol_array | @ruby_token_character | @ruby_token_heredoc_beginning | @ruby_token_simple_symbol | @ruby_unary | @ruby_underscore_lhs | @ruby_underscore_simple_numeric | @ruby_unless | @ruby_until | @ruby_while | @ruby_yield
+
+@ruby_underscore_simple_numeric = @ruby_complex | @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+@ruby_underscore_statement = @ruby_alias | @ruby_begin_block | @ruby_end_block | @ruby_if_modifier | @ruby_rescue_modifier | @ruby_undef | @ruby_underscore_expression | @ruby_unless_modifier | @ruby_until_modifier | @ruby_while_modifier
+
+@ruby_underscore_variable = @ruby_token_constant | @ruby_token_identifier | @ruby_token_self | @ruby_token_super | @ruby_underscore_nonlocal_variable
+
+ruby_alias_def(
+  unique int id: @ruby_alias,
+  int alias: @ruby_underscore_method_name ref,
+  int name: @ruby_underscore_method_name ref
+);
+
+#keyset[ruby_alternative_pattern, index]
+ruby_alternative_pattern_alternatives(
+  int ruby_alternative_pattern: @ruby_alternative_pattern ref,
+  int index: int ref,
+  unique int alternatives: @ruby_underscore_pattern_expr_basic ref
+);
+
+ruby_alternative_pattern_def(
+  unique int id: @ruby_alternative_pattern
+);
+
+@ruby_argument_list_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_argument_list, index]
+ruby_argument_list_child(
+  int ruby_argument_list: @ruby_argument_list ref,
+  int index: int ref,
+  unique int child: @ruby_argument_list_child_type ref
+);
+
+ruby_argument_list_def(
+  unique int id: @ruby_argument_list
+);
+
+@ruby_array_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_array, index]
+ruby_array_child(
+  int ruby_array: @ruby_array ref,
+  int index: int ref,
+  unique int child: @ruby_array_child_type ref
+);
+
+ruby_array_def(
+  unique int id: @ruby_array
+);
+
+ruby_array_pattern_class(
+  unique int ruby_array_pattern: @ruby_array_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_array_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_array_pattern, index]
+ruby_array_pattern_child(
+  int ruby_array_pattern: @ruby_array_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_array_pattern_child_type ref
+);
+
+ruby_array_pattern_def(
+  unique int id: @ruby_array_pattern
+);
+
+ruby_as_pattern_def(
+  unique int id: @ruby_as_pattern,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_assignment_left_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+@ruby_assignment_right_type = @ruby_rescue_modifier | @ruby_right_assignment_list | @ruby_splat_argument | @ruby_underscore_expression
+
+ruby_assignment_def(
+  unique int id: @ruby_assignment,
+  int left: @ruby_assignment_left_type ref,
+  int right: @ruby_assignment_right_type ref
+);
+
+@ruby_bare_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_string, index]
+ruby_bare_string_child(
+  int ruby_bare_string: @ruby_bare_string ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string_child_type ref
+);
+
+ruby_bare_string_def(
+  unique int id: @ruby_bare_string
+);
+
+@ruby_bare_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_bare_symbol, index]
+ruby_bare_symbol_child(
+  int ruby_bare_symbol: @ruby_bare_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol_child_type ref
+);
+
+ruby_bare_symbol_def(
+  unique int id: @ruby_bare_symbol
+);
+
+@ruby_begin_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin, index]
+ruby_begin_child(
+  int ruby_begin: @ruby_begin ref,
+  int index: int ref,
+  unique int child: @ruby_begin_child_type ref
+);
+
+ruby_begin_def(
+  unique int id: @ruby_begin
+);
+
+@ruby_begin_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_begin_block, index]
+ruby_begin_block_child(
+  int ruby_begin_block: @ruby_begin_block ref,
+  int index: int ref,
+  unique int child: @ruby_begin_block_child_type ref
+);
+
+ruby_begin_block_def(
+  unique int id: @ruby_begin_block
+);
+
+@ruby_binary_left_type = @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_binary.operator of
+  0 = @ruby_binary_bangequal
+| 1 = @ruby_binary_bangtilde
+| 2 = @ruby_binary_percent
+| 3 = @ruby_binary_ampersand
+| 4 = @ruby_binary_ampersandampersand
+| 5 = @ruby_binary_star
+| 6 = @ruby_binary_starstar
+| 7 = @ruby_binary_plus
+| 8 = @ruby_binary_minus
+| 9 = @ruby_binary_slash
+| 10 = @ruby_binary_langle
+| 11 = @ruby_binary_langlelangle
+| 12 = @ruby_binary_langleequal
+| 13 = @ruby_binary_langleequalrangle
+| 14 = @ruby_binary_equalequal
+| 15 = @ruby_binary_equalequalequal
+| 16 = @ruby_binary_equaltilde
+| 17 = @ruby_binary_rangle
+| 18 = @ruby_binary_rangleequal
+| 19 = @ruby_binary_ranglerangle
+| 20 = @ruby_binary_caret
+| 21 = @ruby_binary_and
+| 22 = @ruby_binary_or
+| 23 = @ruby_binary_pipe
+| 24 = @ruby_binary_pipepipe
+;
+
+
+ruby_binary_def(
+  unique int id: @ruby_binary,
+  int left: @ruby_binary_left_type ref,
+  int operator: int ref,
+  int right: @ruby_underscore_expression ref
+);
+
+ruby_block_body(
+  unique int ruby_block: @ruby_block ref,
+  unique int body: @ruby_block_body ref
+);
+
+ruby_block_parameters(
+  unique int ruby_block: @ruby_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_block_def(
+  unique int id: @ruby_block
+);
+
+ruby_block_argument_child(
+  unique int ruby_block_argument: @ruby_block_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_block_argument_def(
+  unique int id: @ruby_block_argument
+);
+
+@ruby_block_body_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_block_body, index]
+ruby_block_body_child(
+  int ruby_block_body: @ruby_block_body ref,
+  int index: int ref,
+  unique int child: @ruby_block_body_child_type ref
+);
+
+ruby_block_body_def(
+  unique int id: @ruby_block_body
+);
+
+ruby_block_parameter_name(
+  unique int ruby_block_parameter: @ruby_block_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_block_parameter_def(
+  unique int id: @ruby_block_parameter
+);
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_locals(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int locals: @ruby_token_identifier ref
+);
+
+@ruby_block_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_block_parameters, index]
+ruby_block_parameters_child(
+  int ruby_block_parameters: @ruby_block_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_block_parameters_child_type ref
+);
+
+ruby_block_parameters_def(
+  unique int id: @ruby_block_parameters
+);
+
+@ruby_body_statement_child_type = @ruby_else | @ruby_ensure | @ruby_rescue | @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_body_statement, index]
+ruby_body_statement_child(
+  int ruby_body_statement: @ruby_body_statement ref,
+  int index: int ref,
+  unique int child: @ruby_body_statement_child_type ref
+);
+
+ruby_body_statement_def(
+  unique int id: @ruby_body_statement
+);
+
+ruby_break_child(
+  unique int ruby_break: @ruby_break ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_break_def(
+  unique int id: @ruby_break
+);
+
+ruby_call_arguments(
+  unique int ruby_call: @ruby_call ref,
+  unique int arguments: @ruby_argument_list ref
+);
+
+@ruby_call_block_type = @ruby_block | @ruby_do_block
+
+ruby_call_block(
+  unique int ruby_call: @ruby_call ref,
+  unique int block: @ruby_call_block_type ref
+);
+
+@ruby_call_method_type = @ruby_token_operator | @ruby_underscore_variable
+
+ruby_call_method(
+  unique int ruby_call: @ruby_call ref,
+  unique int method: @ruby_call_method_type ref
+);
+
+ruby_call_operator(
+  unique int ruby_call: @ruby_call ref,
+  unique int operator: @ruby_underscore_call_operator ref
+);
+
+ruby_call_receiver(
+  unique int ruby_call: @ruby_call ref,
+  unique int receiver: @ruby_underscore_primary ref
+);
+
+ruby_call_def(
+  unique int id: @ruby_call
+);
+
+ruby_case_value(
+  unique int ruby_case__: @ruby_case__ ref,
+  unique int value: @ruby_underscore_statement ref
+);
+
+@ruby_case_child_type = @ruby_else | @ruby_when
+
+#keyset[ruby_case__, index]
+ruby_case_child(
+  int ruby_case__: @ruby_case__ ref,
+  int index: int ref,
+  unique int child: @ruby_case_child_type ref
+);
+
+ruby_case_def(
+  unique int id: @ruby_case__
+);
+
+#keyset[ruby_case_match, index]
+ruby_case_match_clauses(
+  int ruby_case_match: @ruby_case_match ref,
+  int index: int ref,
+  unique int clauses: @ruby_in_clause ref
+);
+
+ruby_case_match_else(
+  unique int ruby_case_match: @ruby_case_match ref,
+  unique int else: @ruby_else ref
+);
+
+ruby_case_match_def(
+  unique int id: @ruby_case_match,
+  int value: @ruby_underscore_statement ref
+);
+
+#keyset[ruby_chained_string, index]
+ruby_chained_string_child(
+  int ruby_chained_string: @ruby_chained_string ref,
+  int index: int ref,
+  unique int child: @ruby_string__ ref
+);
+
+ruby_chained_string_def(
+  unique int id: @ruby_chained_string
+);
+
+ruby_class_body(
+  unique int ruby_class: @ruby_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_class_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_class_superclass(
+  unique int ruby_class: @ruby_class ref,
+  unique int superclass: @ruby_superclass ref
+);
+
+ruby_class_def(
+  unique int id: @ruby_class,
+  int name: @ruby_class_name_type ref
+);
+
+@ruby_complex_child_type = @ruby_rational | @ruby_token_float | @ruby_token_integer
+
+ruby_complex_def(
+  unique int id: @ruby_complex,
+  int child: @ruby_complex_child_type ref
+);
+
+ruby_conditional_def(
+  unique int id: @ruby_conditional,
+  int alternative: @ruby_underscore_arg ref,
+  int condition: @ruby_underscore_arg ref,
+  int consequence: @ruby_underscore_arg ref
+);
+
+@ruby_delimited_symbol_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_delimited_symbol, index]
+ruby_delimited_symbol_child(
+  int ruby_delimited_symbol: @ruby_delimited_symbol ref,
+  int index: int ref,
+  unique int child: @ruby_delimited_symbol_child_type ref
+);
+
+ruby_delimited_symbol_def(
+  unique int id: @ruby_delimited_symbol
+);
+
+@ruby_destructured_left_assignment_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_destructured_left_assignment, index]
+ruby_destructured_left_assignment_child(
+  int ruby_destructured_left_assignment: @ruby_destructured_left_assignment ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_left_assignment_child_type ref
+);
+
+ruby_destructured_left_assignment_def(
+  unique int id: @ruby_destructured_left_assignment
+);
+
+@ruby_destructured_parameter_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_destructured_parameter, index]
+ruby_destructured_parameter_child(
+  int ruby_destructured_parameter: @ruby_destructured_parameter ref,
+  int index: int ref,
+  unique int child: @ruby_destructured_parameter_child_type ref
+);
+
+ruby_destructured_parameter_def(
+  unique int id: @ruby_destructured_parameter
+);
+
+@ruby_do_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_do, index]
+ruby_do_child(
+  int ruby_do: @ruby_do ref,
+  int index: int ref,
+  unique int child: @ruby_do_child_type ref
+);
+
+ruby_do_def(
+  unique int id: @ruby_do
+);
+
+ruby_do_block_body(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_do_block_parameters(
+  unique int ruby_do_block: @ruby_do_block ref,
+  unique int parameters: @ruby_block_parameters ref
+);
+
+ruby_do_block_def(
+  unique int id: @ruby_do_block
+);
+
+@ruby_element_reference_block_type = @ruby_block | @ruby_do_block
+
+ruby_element_reference_block(
+  unique int ruby_element_reference: @ruby_element_reference ref,
+  unique int block: @ruby_element_reference_block_type ref
+);
+
+@ruby_element_reference_child_type = @ruby_block_argument | @ruby_hash_splat_argument | @ruby_pair | @ruby_splat_argument | @ruby_token_forward_argument | @ruby_underscore_expression
+
+#keyset[ruby_element_reference, index]
+ruby_element_reference_child(
+  int ruby_element_reference: @ruby_element_reference ref,
+  int index: int ref,
+  unique int child: @ruby_element_reference_child_type ref
+);
+
+ruby_element_reference_def(
+  unique int id: @ruby_element_reference,
+  int object: @ruby_underscore_primary ref
+);
+
+@ruby_else_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_else, index]
+ruby_else_child(
+  int ruby_else: @ruby_else ref,
+  int index: int ref,
+  unique int child: @ruby_else_child_type ref
+);
+
+ruby_else_def(
+  unique int id: @ruby_else
+);
+
+@ruby_elsif_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_elsif_alternative(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int alternative: @ruby_elsif_alternative_type ref
+);
+
+ruby_elsif_consequence(
+  unique int ruby_elsif: @ruby_elsif ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_elsif_def(
+  unique int id: @ruby_elsif,
+  int condition: @ruby_underscore_statement ref
+);
+
+@ruby_end_block_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_end_block, index]
+ruby_end_block_child(
+  int ruby_end_block: @ruby_end_block ref,
+  int index: int ref,
+  unique int child: @ruby_end_block_child_type ref
+);
+
+ruby_end_block_def(
+  unique int id: @ruby_end_block
+);
+
+@ruby_ensure_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_ensure, index]
+ruby_ensure_child(
+  int ruby_ensure: @ruby_ensure ref,
+  int index: int ref,
+  unique int child: @ruby_ensure_child_type ref
+);
+
+ruby_ensure_def(
+  unique int id: @ruby_ensure
+);
+
+ruby_exception_variable_def(
+  unique int id: @ruby_exception_variable,
+  int child: @ruby_underscore_lhs ref
+);
+
+@ruby_exceptions_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_exceptions, index]
+ruby_exceptions_child(
+  int ruby_exceptions: @ruby_exceptions ref,
+  int index: int ref,
+  unique int child: @ruby_exceptions_child_type ref
+);
+
+ruby_exceptions_def(
+  unique int id: @ruby_exceptions
+);
+
+ruby_expression_reference_pattern_def(
+  unique int id: @ruby_expression_reference_pattern,
+  int value: @ruby_underscore_expression ref
+);
+
+ruby_find_pattern_class(
+  unique int ruby_find_pattern: @ruby_find_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_find_pattern_child_type = @ruby_splat_parameter | @ruby_underscore_pattern_expr
+
+#keyset[ruby_find_pattern, index]
+ruby_find_pattern_child(
+  int ruby_find_pattern: @ruby_find_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_find_pattern_child_type ref
+);
+
+ruby_find_pattern_def(
+  unique int id: @ruby_find_pattern
+);
+
+@ruby_for_pattern_type = @ruby_left_assignment_list | @ruby_underscore_lhs
+
+ruby_for_def(
+  unique int id: @ruby_for,
+  int body: @ruby_do ref,
+  int pattern: @ruby_for_pattern_type ref,
+  int value: @ruby_in ref
+);
+
+@ruby_hash_child_type = @ruby_hash_splat_argument | @ruby_pair
+
+#keyset[ruby_hash, index]
+ruby_hash_child(
+  int ruby_hash: @ruby_hash ref,
+  int index: int ref,
+  unique int child: @ruby_hash_child_type ref
+);
+
+ruby_hash_def(
+  unique int id: @ruby_hash
+);
+
+ruby_hash_pattern_class(
+  unique int ruby_hash_pattern: @ruby_hash_pattern ref,
+  unique int class: @ruby_underscore_pattern_constant ref
+);
+
+@ruby_hash_pattern_child_type = @ruby_hash_splat_parameter | @ruby_keyword_pattern | @ruby_token_hash_splat_nil
+
+#keyset[ruby_hash_pattern, index]
+ruby_hash_pattern_child(
+  int ruby_hash_pattern: @ruby_hash_pattern ref,
+  int index: int ref,
+  unique int child: @ruby_hash_pattern_child_type ref
+);
+
+ruby_hash_pattern_def(
+  unique int id: @ruby_hash_pattern
+);
+
+ruby_hash_splat_argument_child(
+  unique int ruby_hash_splat_argument: @ruby_hash_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_hash_splat_argument_def(
+  unique int id: @ruby_hash_splat_argument
+);
+
+ruby_hash_splat_parameter_name(
+  unique int ruby_hash_splat_parameter: @ruby_hash_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_hash_splat_parameter_def(
+  unique int id: @ruby_hash_splat_parameter
+);
+
+@ruby_heredoc_body_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_heredoc_content | @ruby_token_heredoc_end
+
+#keyset[ruby_heredoc_body, index]
+ruby_heredoc_body_child(
+  int ruby_heredoc_body: @ruby_heredoc_body ref,
+  int index: int ref,
+  unique int child: @ruby_heredoc_body_child_type ref
+);
+
+ruby_heredoc_body_def(
+  unique int id: @ruby_heredoc_body
+);
+
+@ruby_if_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_if_alternative(
+  unique int ruby_if: @ruby_if ref,
+  unique int alternative: @ruby_if_alternative_type ref
+);
+
+ruby_if_consequence(
+  unique int ruby_if: @ruby_if ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_if_def(
+  unique int id: @ruby_if,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_if_guard_def(
+  unique int id: @ruby_if_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_if_modifier_def(
+  unique int id: @ruby_if_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_in_def(
+  unique int id: @ruby_in,
+  int child: @ruby_underscore_arg ref
+);
+
+ruby_in_clause_body(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int body: @ruby_then ref
+);
+
+@ruby_in_clause_guard_type = @ruby_if_guard | @ruby_unless_guard
+
+ruby_in_clause_guard(
+  unique int ruby_in_clause: @ruby_in_clause ref,
+  unique int guard: @ruby_in_clause_guard_type ref
+);
+
+ruby_in_clause_def(
+  unique int id: @ruby_in_clause,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref
+);
+
+@ruby_interpolation_child_type = @ruby_token_empty_statement | @ruby_underscore_nonlocal_variable | @ruby_underscore_statement
+
+#keyset[ruby_interpolation, index]
+ruby_interpolation_child(
+  int ruby_interpolation: @ruby_interpolation ref,
+  int index: int ref,
+  unique int child: @ruby_interpolation_child_type ref
+);
+
+ruby_interpolation_def(
+  unique int id: @ruby_interpolation
+);
+
+ruby_keyword_parameter_value(
+  unique int ruby_keyword_parameter: @ruby_keyword_parameter ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_keyword_parameter_def(
+  unique int id: @ruby_keyword_parameter,
+  int name: @ruby_token_identifier ref
+);
+
+@ruby_keyword_pattern_key_type = @ruby_string__ | @ruby_token_hash_key_symbol
+
+ruby_keyword_pattern_value(
+  unique int ruby_keyword_pattern: @ruby_keyword_pattern ref,
+  unique int value: @ruby_underscore_pattern_expr ref
+);
+
+ruby_keyword_pattern_def(
+  unique int id: @ruby_keyword_pattern,
+  int key__: @ruby_keyword_pattern_key_type ref
+);
+
+@ruby_lambda_body_type = @ruby_block | @ruby_do_block
+
+ruby_lambda_parameters(
+  unique int ruby_lambda: @ruby_lambda ref,
+  unique int parameters: @ruby_lambda_parameters ref
+);
+
+ruby_lambda_def(
+  unique int id: @ruby_lambda,
+  int body: @ruby_lambda_body_type ref
+);
+
+@ruby_lambda_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_lambda_parameters, index]
+ruby_lambda_parameters_child(
+  int ruby_lambda_parameters: @ruby_lambda_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_lambda_parameters_child_type ref
+);
+
+ruby_lambda_parameters_def(
+  unique int id: @ruby_lambda_parameters
+);
+
+@ruby_left_assignment_list_child_type = @ruby_destructured_left_assignment | @ruby_rest_assignment | @ruby_underscore_lhs
+
+#keyset[ruby_left_assignment_list, index]
+ruby_left_assignment_list_child(
+  int ruby_left_assignment_list: @ruby_left_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_left_assignment_list_child_type ref
+);
+
+ruby_left_assignment_list_def(
+  unique int id: @ruby_left_assignment_list
+);
+
+ruby_match_pattern_def(
+  unique int id: @ruby_match_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_method_body(
+  unique int ruby_method: @ruby_method ref,
+  unique int body: @ruby_method_body_type ref
+);
+
+ruby_method_parameters(
+  unique int ruby_method: @ruby_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_method_def(
+  unique int id: @ruby_method,
+  int name: @ruby_underscore_method_name ref
+);
+
+@ruby_method_parameters_child_type = @ruby_block_parameter | @ruby_destructured_parameter | @ruby_hash_splat_parameter | @ruby_keyword_parameter | @ruby_optional_parameter | @ruby_splat_parameter | @ruby_token_forward_parameter | @ruby_token_hash_splat_nil | @ruby_token_identifier
+
+#keyset[ruby_method_parameters, index]
+ruby_method_parameters_child(
+  int ruby_method_parameters: @ruby_method_parameters ref,
+  int index: int ref,
+  unique int child: @ruby_method_parameters_child_type ref
+);
+
+ruby_method_parameters_def(
+  unique int id: @ruby_method_parameters
+);
+
+ruby_module_body(
+  unique int ruby_module: @ruby_module ref,
+  unique int body: @ruby_body_statement ref
+);
+
+@ruby_module_name_type = @ruby_scope_resolution | @ruby_token_constant
+
+ruby_module_def(
+  unique int id: @ruby_module,
+  int name: @ruby_module_name_type ref
+);
+
+ruby_next_child(
+  unique int ruby_next: @ruby_next ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_next_def(
+  unique int id: @ruby_next
+);
+
+case @ruby_operator_assignment.operator of
+  0 = @ruby_operator_assignment_percentequal
+| 1 = @ruby_operator_assignment_ampersandampersandequal
+| 2 = @ruby_operator_assignment_ampersandequal
+| 3 = @ruby_operator_assignment_starstarequal
+| 4 = @ruby_operator_assignment_starequal
+| 5 = @ruby_operator_assignment_plusequal
+| 6 = @ruby_operator_assignment_minusequal
+| 7 = @ruby_operator_assignment_slashequal
+| 8 = @ruby_operator_assignment_langlelangleequal
+| 9 = @ruby_operator_assignment_ranglerangleequal
+| 10 = @ruby_operator_assignment_caretequal
+| 11 = @ruby_operator_assignment_pipeequal
+| 12 = @ruby_operator_assignment_pipepipeequal
+;
+
+
+@ruby_operator_assignment_right_type = @ruby_rescue_modifier | @ruby_underscore_expression
+
+ruby_operator_assignment_def(
+  unique int id: @ruby_operator_assignment,
+  int left: @ruby_underscore_lhs ref,
+  int operator: int ref,
+  int right: @ruby_operator_assignment_right_type ref
+);
+
+ruby_optional_parameter_def(
+  unique int id: @ruby_optional_parameter,
+  int name: @ruby_token_identifier ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_pair_key_type = @ruby_string__ | @ruby_token_hash_key_symbol | @ruby_underscore_arg
+
+ruby_pair_value(
+  unique int ruby_pair: @ruby_pair ref,
+  unique int value: @ruby_underscore_arg ref
+);
+
+ruby_pair_def(
+  unique int id: @ruby_pair,
+  int key__: @ruby_pair_key_type ref
+);
+
+ruby_parenthesized_pattern_def(
+  unique int id: @ruby_parenthesized_pattern,
+  int child: @ruby_underscore_pattern_expr ref
+);
+
+@ruby_parenthesized_statements_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_parenthesized_statements, index]
+ruby_parenthesized_statements_child(
+  int ruby_parenthesized_statements: @ruby_parenthesized_statements ref,
+  int index: int ref,
+  unique int child: @ruby_parenthesized_statements_child_type ref
+);
+
+ruby_parenthesized_statements_def(
+  unique int id: @ruby_parenthesized_statements
+);
+
+@ruby_pattern_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+ruby_pattern_def(
+  unique int id: @ruby_pattern,
+  int child: @ruby_pattern_child_type ref
+);
+
+@ruby_program_child_type = @ruby_token_empty_statement | @ruby_token_uninterpreted | @ruby_underscore_statement
+
+#keyset[ruby_program, index]
+ruby_program_child(
+  int ruby_program: @ruby_program ref,
+  int index: int ref,
+  unique int child: @ruby_program_child_type ref
+);
+
+ruby_program_def(
+  unique int id: @ruby_program
+);
+
+@ruby_range_begin_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_begin(
+  unique int ruby_range: @ruby_range ref,
+  unique int begin: @ruby_range_begin_type ref
+);
+
+@ruby_range_end_type = @ruby_underscore_arg | @ruby_underscore_pattern_primitive
+
+ruby_range_end(
+  unique int ruby_range: @ruby_range ref,
+  unique int end: @ruby_range_end_type ref
+);
+
+case @ruby_range.operator of
+  0 = @ruby_range_dotdot
+| 1 = @ruby_range_dotdotdot
+;
+
+
+ruby_range_def(
+  unique int id: @ruby_range,
+  int operator: int ref
+);
+
+@ruby_rational_child_type = @ruby_token_float | @ruby_token_integer
+
+ruby_rational_def(
+  unique int id: @ruby_rational,
+  int child: @ruby_rational_child_type ref
+);
+
+ruby_redo_child(
+  unique int ruby_redo: @ruby_redo ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_redo_def(
+  unique int id: @ruby_redo
+);
+
+@ruby_regex_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_regex, index]
+ruby_regex_child(
+  int ruby_regex: @ruby_regex ref,
+  int index: int ref,
+  unique int child: @ruby_regex_child_type ref
+);
+
+ruby_regex_def(
+  unique int id: @ruby_regex
+);
+
+ruby_rescue_body(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int body: @ruby_then ref
+);
+
+ruby_rescue_exceptions(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int exceptions: @ruby_exceptions ref
+);
+
+ruby_rescue_variable(
+  unique int ruby_rescue: @ruby_rescue ref,
+  unique int variable: @ruby_exception_variable ref
+);
+
+ruby_rescue_def(
+  unique int id: @ruby_rescue
+);
+
+@ruby_rescue_modifier_body_type = @ruby_underscore_arg | @ruby_underscore_statement
+
+ruby_rescue_modifier_def(
+  unique int id: @ruby_rescue_modifier,
+  int body: @ruby_rescue_modifier_body_type ref,
+  int handler: @ruby_underscore_expression ref
+);
+
+ruby_rest_assignment_child(
+  unique int ruby_rest_assignment: @ruby_rest_assignment ref,
+  unique int child: @ruby_underscore_lhs ref
+);
+
+ruby_rest_assignment_def(
+  unique int id: @ruby_rest_assignment
+);
+
+ruby_retry_child(
+  unique int ruby_retry: @ruby_retry ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_retry_def(
+  unique int id: @ruby_retry
+);
+
+ruby_return_child(
+  unique int ruby_return: @ruby_return ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_return_def(
+  unique int id: @ruby_return
+);
+
+@ruby_right_assignment_list_child_type = @ruby_splat_argument | @ruby_underscore_arg
+
+#keyset[ruby_right_assignment_list, index]
+ruby_right_assignment_list_child(
+  int ruby_right_assignment_list: @ruby_right_assignment_list ref,
+  int index: int ref,
+  unique int child: @ruby_right_assignment_list_child_type ref
+);
+
+ruby_right_assignment_list_def(
+  unique int id: @ruby_right_assignment_list
+);
+
+@ruby_scope_resolution_scope_type = @ruby_underscore_pattern_constant | @ruby_underscore_primary
+
+ruby_scope_resolution_scope(
+  unique int ruby_scope_resolution: @ruby_scope_resolution ref,
+  unique int scope: @ruby_scope_resolution_scope_type ref
+);
+
+ruby_scope_resolution_def(
+  unique int id: @ruby_scope_resolution,
+  int name: @ruby_token_constant ref
+);
+
+ruby_setter_def(
+  unique int id: @ruby_setter,
+  int name: @ruby_token_identifier ref
+);
+
+ruby_singleton_class_body(
+  unique int ruby_singleton_class: @ruby_singleton_class ref,
+  unique int body: @ruby_body_statement ref
+);
+
+ruby_singleton_class_def(
+  unique int id: @ruby_singleton_class,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_singleton_method_body_type = @ruby_body_statement | @ruby_rescue_modifier | @ruby_underscore_arg
+
+ruby_singleton_method_body(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int body: @ruby_singleton_method_body_type ref
+);
+
+@ruby_singleton_method_object_type = @ruby_underscore_arg | @ruby_underscore_variable
+
+ruby_singleton_method_parameters(
+  unique int ruby_singleton_method: @ruby_singleton_method ref,
+  unique int parameters: @ruby_method_parameters ref
+);
+
+ruby_singleton_method_def(
+  unique int id: @ruby_singleton_method,
+  int name: @ruby_underscore_method_name ref,
+  int object: @ruby_singleton_method_object_type ref
+);
+
+ruby_splat_argument_child(
+  unique int ruby_splat_argument: @ruby_splat_argument ref,
+  unique int child: @ruby_underscore_arg ref
+);
+
+ruby_splat_argument_def(
+  unique int id: @ruby_splat_argument
+);
+
+ruby_splat_parameter_name(
+  unique int ruby_splat_parameter: @ruby_splat_parameter ref,
+  unique int name: @ruby_token_identifier ref
+);
+
+ruby_splat_parameter_def(
+  unique int id: @ruby_splat_parameter
+);
+
+@ruby_string_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_string__, index]
+ruby_string_child(
+  int ruby_string__: @ruby_string__ ref,
+  int index: int ref,
+  unique int child: @ruby_string_child_type ref
+);
+
+ruby_string_def(
+  unique int id: @ruby_string__
+);
+
+#keyset[ruby_string_array, index]
+ruby_string_array_child(
+  int ruby_string_array: @ruby_string_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_string ref
+);
+
+ruby_string_array_def(
+  unique int id: @ruby_string_array
+);
+
+@ruby_subshell_child_type = @ruby_interpolation | @ruby_token_escape_sequence | @ruby_token_string_content
+
+#keyset[ruby_subshell, index]
+ruby_subshell_child(
+  int ruby_subshell: @ruby_subshell ref,
+  int index: int ref,
+  unique int child: @ruby_subshell_child_type ref
+);
+
+ruby_subshell_def(
+  unique int id: @ruby_subshell
+);
+
+ruby_superclass_def(
+  unique int id: @ruby_superclass,
+  int child: @ruby_underscore_expression ref
+);
+
+#keyset[ruby_symbol_array, index]
+ruby_symbol_array_child(
+  int ruby_symbol_array: @ruby_symbol_array ref,
+  int index: int ref,
+  unique int child: @ruby_bare_symbol ref
+);
+
+ruby_symbol_array_def(
+  unique int id: @ruby_symbol_array
+);
+
+ruby_test_pattern_def(
+  unique int id: @ruby_test_pattern,
+  int pattern: @ruby_underscore_pattern_top_expr_body ref,
+  int value: @ruby_underscore_arg ref
+);
+
+@ruby_then_child_type = @ruby_token_empty_statement | @ruby_underscore_statement
+
+#keyset[ruby_then, index]
+ruby_then_child(
+  int ruby_then: @ruby_then ref,
+  int index: int ref,
+  unique int child: @ruby_then_child_type ref
+);
+
+ruby_then_def(
+  unique int id: @ruby_then
+);
+
+@ruby_unary_operand_type = @ruby_parenthesized_statements | @ruby_underscore_expression | @ruby_underscore_simple_numeric
+
+case @ruby_unary.operator of
+  0 = @ruby_unary_bang
+| 1 = @ruby_unary_plus
+| 2 = @ruby_unary_minus
+| 3 = @ruby_unary_definedquestion
+| 4 = @ruby_unary_not
+| 5 = @ruby_unary_tilde
+;
+
+
+ruby_unary_def(
+  unique int id: @ruby_unary,
+  int operand: @ruby_unary_operand_type ref,
+  int operator: int ref
+);
+
+#keyset[ruby_undef, index]
+ruby_undef_child(
+  int ruby_undef: @ruby_undef ref,
+  int index: int ref,
+  unique int child: @ruby_underscore_method_name ref
+);
+
+ruby_undef_def(
+  unique int id: @ruby_undef
+);
+
+@ruby_unless_alternative_type = @ruby_else | @ruby_elsif
+
+ruby_unless_alternative(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int alternative: @ruby_unless_alternative_type ref
+);
+
+ruby_unless_consequence(
+  unique int ruby_unless: @ruby_unless ref,
+  unique int consequence: @ruby_then ref
+);
+
+ruby_unless_def(
+  unique int id: @ruby_unless,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_unless_guard_def(
+  unique int id: @ruby_unless_guard,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_unless_modifier_def(
+  unique int id: @ruby_unless_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_until_def(
+  unique int id: @ruby_until,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_until_modifier_def(
+  unique int id: @ruby_until_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+@ruby_variable_reference_pattern_name_type = @ruby_token_identifier | @ruby_underscore_nonlocal_variable
+
+ruby_variable_reference_pattern_def(
+  unique int id: @ruby_variable_reference_pattern,
+  int name: @ruby_variable_reference_pattern_name_type ref
+);
+
+ruby_when_body(
+  unique int ruby_when: @ruby_when ref,
+  unique int body: @ruby_then ref
+);
+
+#keyset[ruby_when, index]
+ruby_when_pattern(
+  int ruby_when: @ruby_when ref,
+  int index: int ref,
+  unique int pattern: @ruby_pattern ref
+);
+
+ruby_when_def(
+  unique int id: @ruby_when
+);
+
+ruby_while_def(
+  unique int id: @ruby_while,
+  int body: @ruby_do ref,
+  int condition: @ruby_underscore_statement ref
+);
+
+ruby_while_modifier_def(
+  unique int id: @ruby_while_modifier,
+  int body: @ruby_underscore_statement ref,
+  int condition: @ruby_underscore_expression ref
+);
+
+ruby_yield_child(
+  unique int ruby_yield: @ruby_yield ref,
+  unique int child: @ruby_argument_list ref
+);
+
+ruby_yield_def(
+  unique int id: @ruby_yield
+);
+
+ruby_tokeninfo(
+  unique int id: @ruby_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @ruby_token.kind of
+  0 = @ruby_reserved_word
+| 1 = @ruby_token_character
+| 2 = @ruby_token_class_variable
+| 3 = @ruby_token_comment
+| 4 = @ruby_token_constant
+| 5 = @ruby_token_empty_statement
+| 6 = @ruby_token_encoding
+| 7 = @ruby_token_escape_sequence
+| 8 = @ruby_token_false
+| 9 = @ruby_token_file
+| 10 = @ruby_token_float
+| 11 = @ruby_token_forward_argument
+| 12 = @ruby_token_forward_parameter
+| 13 = @ruby_token_global_variable
+| 14 = @ruby_token_hash_key_symbol
+| 15 = @ruby_token_hash_splat_nil
+| 16 = @ruby_token_heredoc_beginning
+| 17 = @ruby_token_heredoc_content
+| 18 = @ruby_token_heredoc_end
+| 19 = @ruby_token_identifier
+| 20 = @ruby_token_instance_variable
+| 21 = @ruby_token_integer
+| 22 = @ruby_token_line
+| 23 = @ruby_token_nil
+| 24 = @ruby_token_operator
+| 25 = @ruby_token_self
+| 26 = @ruby_token_simple_symbol
+| 27 = @ruby_token_string_content
+| 28 = @ruby_token_super
+| 29 = @ruby_token_true
+| 30 = @ruby_token_uninterpreted
+;
+
+
+@ruby_ast_node = @ruby_alias | @ruby_alternative_pattern | @ruby_argument_list | @ruby_array | @ruby_array_pattern | @ruby_as_pattern | @ruby_assignment | @ruby_bare_string | @ruby_bare_symbol | @ruby_begin | @ruby_begin_block | @ruby_binary | @ruby_block | @ruby_block_argument | @ruby_block_body | @ruby_block_parameter | @ruby_block_parameters | @ruby_body_statement | @ruby_break | @ruby_call | @ruby_case__ | @ruby_case_match | @ruby_chained_string | @ruby_class | @ruby_complex | @ruby_conditional | @ruby_delimited_symbol | @ruby_destructured_left_assignment | @ruby_destructured_parameter | @ruby_do | @ruby_do_block | @ruby_element_reference | @ruby_else | @ruby_elsif | @ruby_end_block | @ruby_ensure | @ruby_exception_variable | @ruby_exceptions | @ruby_expression_reference_pattern | @ruby_find_pattern | @ruby_for | @ruby_hash | @ruby_hash_pattern | @ruby_hash_splat_argument | @ruby_hash_splat_parameter | @ruby_heredoc_body | @ruby_if | @ruby_if_guard | @ruby_if_modifier | @ruby_in | @ruby_in_clause | @ruby_interpolation | @ruby_keyword_parameter | @ruby_keyword_pattern | @ruby_lambda | @ruby_lambda_parameters | @ruby_left_assignment_list | @ruby_match_pattern | @ruby_method | @ruby_method_parameters | @ruby_module | @ruby_next | @ruby_operator_assignment | @ruby_optional_parameter | @ruby_pair | @ruby_parenthesized_pattern | @ruby_parenthesized_statements | @ruby_pattern | @ruby_program | @ruby_range | @ruby_rational | @ruby_redo | @ruby_regex | @ruby_rescue | @ruby_rescue_modifier | @ruby_rest_assignment | @ruby_retry | @ruby_return | @ruby_right_assignment_list | @ruby_scope_resolution | @ruby_setter | @ruby_singleton_class | @ruby_singleton_method | @ruby_splat_argument | @ruby_splat_parameter | @ruby_string__ | @ruby_string_array | @ruby_subshell | @ruby_superclass | @ruby_symbol_array | @ruby_test_pattern | @ruby_then | @ruby_token | @ruby_unary | @ruby_undef | @ruby_unless | @ruby_unless_guard | @ruby_unless_modifier | @ruby_until | @ruby_until_modifier | @ruby_variable_reference_pattern | @ruby_when | @ruby_while | @ruby_while_modifier | @ruby_yield
+
+ruby_ast_node_location(
+  unique int node: @ruby_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+ruby_ast_node_parent(
+  unique int node: @ruby_ast_node ref,
+  int parent: @ruby_ast_node ref,
+  int parent_index: int ref
+);
+
+/*- Erb dbscheme -*/
+erb_comment_directive_child(
+  unique int erb_comment_directive: @erb_comment_directive ref,
+  unique int child: @erb_token_comment ref
+);
+
+erb_comment_directive_def(
+  unique int id: @erb_comment_directive
+);
+
+erb_directive_child(
+  unique int erb_directive: @erb_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_directive_def(
+  unique int id: @erb_directive
+);
+
+erb_graphql_directive_child(
+  unique int erb_graphql_directive: @erb_graphql_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_graphql_directive_def(
+  unique int id: @erb_graphql_directive
+);
+
+erb_output_directive_child(
+  unique int erb_output_directive: @erb_output_directive ref,
+  unique int child: @erb_token_code ref
+);
+
+erb_output_directive_def(
+  unique int id: @erb_output_directive
+);
+
+@erb_template_child_type = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_token_content
+
+#keyset[erb_template, index]
+erb_template_child(
+  int erb_template: @erb_template ref,
+  int index: int ref,
+  unique int child: @erb_template_child_type ref
+);
+
+erb_template_def(
+  unique int id: @erb_template
+);
+
+erb_tokeninfo(
+  unique int id: @erb_token,
+  int kind: int ref,
+  string value: string ref
+);
+
+case @erb_token.kind of
+  0 = @erb_reserved_word
+| 1 = @erb_token_code
+| 2 = @erb_token_comment
+| 3 = @erb_token_content
+;
+
+
+@erb_ast_node = @erb_comment_directive | @erb_directive | @erb_graphql_directive | @erb_output_directive | @erb_template | @erb_token
+
+erb_ast_node_location(
+  unique int node: @erb_ast_node ref,
+  int loc: @location_default ref
+);
+
+#keyset[parent, parent_index]
+erb_ast_node_parent(
+  unique int node: @erb_ast_node ref,
+  int parent: @erb_ast_node ref,
+  int parent_index: int ref
+);
+
diff --git a/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/upgrade.properties b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/upgrade.properties
new file mode 100644
index 00000000000..9b83871fb9b
--- /dev/null
+++ b/ruby/ql/lib/upgrades/40a6b0a5e81115bd870b3a12a1fe954b06362bb7/upgrade.properties
@@ -0,0 +1,2 @@
+description: Add databaseMetadata relation
+compatibility: full
diff --git a/shared/tree-sitter-extractor/src/generator/mod.rs b/shared/tree-sitter-extractor/src/generator/mod.rs
index d972e9fb128..cb35f7ab768 100644
--- a/shared/tree-sitter-extractor/src/generator/mod.rs
+++ b/shared/tree-sitter-extractor/src/generator/mod.rs
@@ -17,6 +17,7 @@ pub fn generate(
     languages: Vec<language::Language>,
     dbscheme_path: PathBuf,
     ql_library_path: PathBuf,
+    add_metadata_relation: bool,
 ) -> std::io::Result<()> {
     let dbscheme_file = File::create(dbscheme_path).map_err(|e| {
         tracing::error!("Failed to create dbscheme file: {}", e);
@@ -32,6 +33,16 @@ pub fn generate(
 
     writeln!(dbscheme_writer, include_str!("prefix.dbscheme"))?;
 
+    // Eventually all languages will have the metadata relation (for overlay support), at which
+    // point this could be moved to prefix.dbscheme.
+    if add_metadata_relation {
+        writeln!(dbscheme_writer, "/*- Database metadata -*/",)?;
+        dbscheme::write(
+            &mut dbscheme_writer,
+            &[dbscheme::Entry::Table(create_database_metadata())],
+        )?;
+    }
+
     let mut ql_writer = LineWriter::new(File::create(ql_library_path)?);
     writeln!(
         ql_writer,
@@ -442,3 +453,26 @@ fn create_token_case<'a>(name: &'a str, token_kinds: Map<&'a str, usize>) -> dbs
         branches,
     }
 }
+
+fn create_database_metadata() -> dbscheme::Table<'static> {
+    dbscheme::Table {
+        name: "databaseMetadata",
+        keysets: None,
+        columns: vec![
+            dbscheme::Column {
+                db_type: dbscheme::DbColumnType::String,
+                name: "metadataKey",
+                unique: false,
+                ql_type: ql::Type::String,
+                ql_type_is_ref: true,
+            },
+            dbscheme::Column {
+                db_type: dbscheme::DbColumnType::String,
+                name: "value",
+                unique: false,
+                ql_type: ql::Type::String,
+                ql_type_is_ref: true,
+            },
+        ],
+    }
+}