goto.cs:
#    2| [Class] Goto
#    4|   5: [Method] Main
#    4|     -1: [TypeMention] Void
#    5|     4: [BlockStmt] {...}
#    6|       0: [BlockStmt] {...}
#    7|         0: [LabelStmt] s1:
#    7|         1: [GotoLabelStmt] goto ...;
#    9|       1: [LabelStmt] s2:
#    9|       2: [LocalVariableDeclStmt] ... ...;
#    9|         0: [LocalVariableDeclAndInitExpr] String s = ...
#    9|           -1: [TypeMention] string
#    9|           0: [LocalVariableAccess] access to local variable s
#    9|           1: [StringLiteralUtf16] "5"
#   10|       3: [SwitchStmt] switch (...) {...}
#   10|         0: [LocalVariableAccess] access to local variable s
#   12|         0: [ConstCase] case ...:
#   12|           0: [ConstantPatternExpr,NullLiteral] null
#   12|         1: [LabelStmt] s3:
#   12|         2: [GotoCaseStmt] goto case ...;
#   12|           0: [StringLiteralUtf16] "1"
#   13|         3: [ConstCase] case ...:
#   13|           0: [ConstantPatternExpr,StringLiteralUtf16] "1"
#   13|         4: [LabelStmt] s4:
#   13|         5: [GotoCaseStmt] goto case ...;
#   13|           0: [StringLiteralUtf16] "2"
#   14|         6: [ConstCase] case ...:
#   14|           0: [ConstantPatternExpr,StringLiteralUtf16] "2"
#   14|         7: [LabelStmt] s5:
#   14|         8: [GotoLabelStmt] goto ...;
#   15|         9: [ConstCase] case ...:
#   15|           0: [ConstantPatternExpr,StringLiteralUtf16] "3"
#   15|         10: [LabelStmt] s6:
#   15|         11: [GotoDefaultStmt] goto default;
#   16|         12: [ConstCase] case ...:
#   16|           0: [ConstantPatternExpr,StringLiteralUtf16] "4"
#   16|         13: [LabelStmt] s7:
#   16|         14: [BreakStmt] break;
#   17|         15: [DefaultCase] default:
#   17|         16: [LabelStmt] s8:
#   17|         17: [GotoCaseStmt] goto case ...;
#   17|           0: [NullLiteral] null
#   19|       4: [LabelStmt] s9:
#   19|       5: [EmptyStmt] ;