Preserve the dot token in case patterns

unified/extractor/tree-sitter-swift/grammar.js

@@ -1930,7 +1930,7 @@ module.exports = grammar({
       seq(
         optional("case"),
         optional(field("type", $.user_type)), // XXX this should just be _type but that creates ambiguity
-        $._dot,
+        field("dot", $._dot),
         field("name", $.simple_identifier),
         optional(field("arguments", $.tuple_pattern))
       ),

unified/extractor/tree-sitter-swift/node-types.yml

@@ -173,6 +173,7 @@ named:
     value?: expression
   case_pattern:
     arguments?: tuple_pattern
+    dot: "."
     name: simple_identifier
     type?: user_type
   catch_block: