csharp73.cs:
#    5| [Class] StackAllocs
#    7|   5: [Method] Fn
#    7|     -1: [TypeMention] Void
#    8|     4: [BlockStmt] {...}
#    9|       0: [LocalVariableDeclStmt] ... ...;
#    9|         0: [LocalVariableDeclAndInitExpr] Char* arr1 = ...
#    9|           -1: [TypeMention] char*
#    9|           0: [LocalVariableAccess] access to local variable arr1
#    9|           1: [Stackalloc] array creation of type Char*
#    9|             -2: [TypeMention] char*
#    9|               1: [TypeMention] char
#    9|             -1: [ArrayInitializer] { ..., ... }
#    9|               0: [CharLiteral] x
#    9|               1: [CharLiteral] y
#   10|       1: [LocalVariableDeclStmt] ... ...;
#   10|         0: [LocalVariableDeclAndInitExpr] Char* arr2 = ...
#   10|           -1: [TypeMention] char*
#   10|           0: [LocalVariableAccess] access to local variable arr2
#   10|           1: [Stackalloc] array creation of type Char*
#   10|             -2: [TypeMention] char*
#   10|               1: [TypeMention] char
#   10|             -1: [ArrayInitializer] { ..., ... }
#   10|               0: [CharLiteral] x
#   10|             0: [IntLiteral] 1
#   11|       2: [LocalVariableDeclStmt] ... ...;
#   11|         0: [LocalVariableDeclAndInitExpr] Char[] arr3 = ...
#   11|           -1: [TypeMention] Char[]
#   11|           0: [LocalVariableAccess] access to local variable arr3
#   11|           1: [ArrayCreation] array creation of type Char[]
#   11|             -2: [TypeMention] Char[]
#   11|               1: [TypeMention] char
#   11|             -1: [ArrayInitializer] { ..., ... }
#   11|               0: [CharLiteral] x
#   12|       3: [LocalVariableDeclStmt] ... ...;
#   12|         0: [LocalVariableDeclAndInitExpr] Char* arr4 = ...
#   12|           -1: [TypeMention] char*
#   12|           0: [LocalVariableAccess] access to local variable arr4
#   12|           1: [Stackalloc] array creation of type Char*
#   12|             -1: [TypeMention] char*
#   12|               1: [TypeMention] char
#   12|             0: [IntLiteral] 10
#   13|       4: [LocalVariableDeclStmt] ... ...;
#   13|         0: [LocalVariableDeclAndInitExpr] Char[] arr5 = ...
#   13|           -1: [TypeMention] Char[]
#   13|           0: [LocalVariableAccess] access to local variable arr5
#   13|           1: [ArrayCreation] array creation of type Char[]
#   13|             -1: [TypeMention] Char[]
#   13|               1: [TypeMention] char
#   13|             0: [IntLiteral] 10
#   14|       5: [LocalVariableDeclStmt] ... ...;
#   14|         0: [LocalVariableDeclAndInitExpr] Int32* arr6 = ...
#   14|           -1: [TypeMention] int*
#   14|           0: [LocalVariableAccess] access to local variable arr6
#   14|           1: [Stackalloc] array creation of type Int32*
#   14|             -1: [ArrayInitializer] { ..., ... }
#   14|               0: [IntLiteral] 1
#   14|               1: [IntLiteral] 2
#   14|               2: [IntLiteral] 3
#   18| [Class] PinnedReference
#   20|   5: [Method] F
#   20|     -1: [TypeMention] Void
#   21|     4: [BlockStmt] {...}
#   22|       0: [LocalVariableDeclStmt] ... ...;
#   22|         0: [LocalVariableDeclAndInitExpr] Span<Byte> buffer = ...
#   22|           -1: [TypeMention] Span<Byte>
#   22|             1: [TypeMention] byte
#   22|           0: [LocalVariableAccess] access to local variable buffer
#   22|           1: [Stackalloc] array creation of type Span<Byte>
#   22|             -1: [TypeMention] Span<Byte>
#   22|               1: [TypeMention] byte
#   22|             0: [IntLiteral] 10
#   24|       1: [LocalVariableDeclStmt] ... ...;
#   24|         0: [LocalVariableDeclAndInitExpr] Span<Int32> t = ...
#   24|           -1: [TypeMention] Span<Int32>
#   24|             1: [TypeMention] int
#   24|           0: [LocalVariableAccess] access to local variable t
#   24|           1: [OperatorCall] call to operator implicit conversion
#   24|             0: [ArrayCreation] array creation of type Int32[]
#   24|               -1: [TypeMention] Int32[]
#   24|                 1: [TypeMention] int
#   24|               0: [IntLiteral] 10
#   27|       2: [BlockStmt] {...}
#   32| [Class] UnmanagedConstraint<>
#-----|   1: (Type parameters)
#   32|     0: [TypeParameter] T
#   36| [Class] EnumConstraint<>
#-----|   1: (Type parameters)
#   36|     0: [TypeParameter] T
#   40| [Class] DelegateConstraint<>
#-----|   1: (Type parameters)
#   40|     0: [TypeParameter] T
#   44| [Class] ExpressionVariables
#   46|   4: [InstanceConstructor] ExpressionVariables
#-----|     2: (Parameters)
#   46|       0: [Parameter] x
#   46|         -1: [TypeMention] int
#   47|     4: [BlockStmt] {...}
#   48|       0: [ExprStmt] ...;
#   48|         0: [AssignExpr] ... = ...
#   48|           0: [ParameterAccess] access to parameter x
#   48|           1: [IntLiteral] 5
#   51|   5: [InstanceConstructor] ExpressionVariables
#   51|     3: [ConstructorInitializer] call to constructor ExpressionVariables
#   51|       0: [LocalVariableDeclExpr] Int32 x
#   52|     4: [BlockStmt] {...}
#   53|       0: [ExprStmt] ...;
#   53|         0: [MethodCall] call to method WriteLine
#   53|           -1: [TypeAccess] access to type Console
#   53|             0: [TypeMention] Console
#   53|           0: [InterpolatedStringExpr] $"..."
#   53|             0: [StringLiteral] "x is "
#   53|             1: [LocalVariableAccess] access to local variable x