Test.java:
#    0| [CompilationUnit] Test
#    1|   1: [Class] Test
#    3|     2: [Method] yield
#    3|       3: [TypeAccess] int
#-----|       4: (Parameters)
#    3|         0: [Parameter] x
#    3|           0: [TypeAccess] int
#    3|       5: [BlockStmt] { ... }
#    3|         0: [ReturnStmt] return ...
#    3|           0: [VarAccess] x
#    5|     3: [Method] secondCall
#    5|       3: [TypeAccess] void
#    5|       5: [BlockStmt] { ... }
#    7|     4: [Method] yieldWrapper
#    7|       3: [TypeAccess] int
#-----|       4: (Parameters)
#    7|         0: [Parameter] x
#    7|           0: [TypeAccess] int
#    7|       5: [BlockStmt] { ... }
#    8|         0: [LocalVariableDeclStmt] var ...;
#    8|           0: [TypeAccess] int
#    8|           1: [LocalVariableDeclExpr] ret
#    8|             0: [ErrorExpr] <error expr>
#    8|               0: [MethodCall] yield(...)
#    8|                 0: [VarAccess] x
#    9|         1: [ExprStmt] <Expr>;
#    9|           0: [MethodCall] secondCall(...)
#   10|         2: [ReturnStmt] return ...
#   10|           0: [VarAccess] ret