csharp72.cs:
#    3| [Class] InModifiers
#    5|   6: [Struct] S
#    9|   7: [Method] F
#    9|     -1: [TypeMention] Void
#-----|     2: (Parameters)
#    9|       0: [Parameter] s
#    9|         -1: [TypeMention] S
#   10|     4: [BlockStmt] {...}
#   13|   8: [Method] CallF
#   13|     -1: [TypeMention] Void
#   14|     4: [BlockStmt] {...}
#   15|       0: [LocalVariableDeclStmt] ... ...;
#   15|         0: [LocalVariableDeclAndInitExpr] S s = ...
#   15|           -1: [TypeMention] S
#   15|           0: [LocalVariableAccess] access to local variable s
#   15|           1: [ObjectCreation] object creation of type S
#   15|             0: [TypeMention] S
#   16|       1: [ExprStmt] ...;
#   16|         0: [MethodCall] call to method F
#   16|           0: [LocalVariableAccess] access to local variable s
#   20| [Class] RefReadonlyReturns
#   22|   6: [Field] s
#   22|     -1: [TypeMention] int
#   24|   7: [Method] F
#   24|     -1: [TypeMention] int
#   25|     4: [BlockStmt] {...}
#   26|       0: [ReturnStmt] return ...;
#   26|         0: [RefExpr] ref ...
#   26|           0: [FieldAccess] access to field s
#   29|   8: [DelegateType] Del
#   32| [Struct] ReadonlyStruct
#   36| [RefStruct] RefStruct
#   40| [RefStruct] ReadonlyRefStruct
#   44| [Class] NumericLiterals
#   46|   6: [Field] binaryValue
#   46|     -1: [TypeMention] int
#   46|     1: [IntLiteral] 85
#   49| [Class] PrivateProtected
#   51|   6: [Field] X
#   51|     -1: [TypeMention] int
#   51|     1: [IntLiteral] 1
#   53|   7: [Method] F
#   53|     -1: [TypeMention] Void
#   53|     4: [BlockStmt] {...}