csharp72.cs:
#    5| [Class] InModifiers
#    7|   5: [Struct] S
#   11|   6: [Method] F
#   11|     -1: [TypeMention] Void
#-----|     2: (Parameters)
#   11|       0: [Parameter] s
#   11|         -1: [TypeMention] S
#   12|     4: [BlockStmt] {...}
#   15|   7: [Method] CallF
#   15|     -1: [TypeMention] Void
#   16|     4: [BlockStmt] {...}
#   17|       0: [LocalVariableDeclStmt] ... ...;
#   17|         0: [LocalVariableDeclAndInitExpr] S s = ...
#   17|           -1: [TypeMention] S
#   17|           0: [LocalVariableAccess] access to local variable s
#   17|           1: [ObjectCreation] object creation of type S
#   17|             0: [TypeMention] S
#   18|       1: [ExprStmt] ...;
#   18|         0: [MethodCall] call to method F
#   18|           0: [LocalVariableAccess] access to local variable s
#   22| [Class] RefReadonlyReturns
#   24|   5: [Field] s
#   24|     -1: [TypeMention] int
#   26|   6: [Method] F
#   26|     -1: [TypeMention] int
#   27|     4: [BlockStmt] {...}
#   28|       0: [ReturnStmt] return ...;
#   28|         0: [RefExpr] ref ...
#   28|           0: [FieldAccess] access to field s
#   31|   7: [DelegateType] Del
#   34| [Struct] ReadonlyStruct
#   38| [Struct] RefStruct
#   42| [Struct] ReadonlyRefStruct
#   46| [Class] NumericLiterals
#   48|   5: [Field] binaryValue
#   48|     -1: [TypeMention] int
#   48|     1: [AssignExpr] ... = ...
#   48|       0: [FieldAccess] access to field binaryValue
#   48|       1: [IntLiteral] 85
#   51| [Class] PrivateProtected
#   53|   5: [Field] X
#   53|     -1: [TypeMention] int
#   53|     1: [AssignExpr] ... = ...
#   53|       0: [FieldAccess] access to field X
#   53|       1: [IntLiteral] 1
#   55|   6: [Method] F
#   55|     -1: [TypeMention] Void
#   55|     4: [BlockStmt] {...}