Test.java:
#    0| [CompilationUnit] Test
#    1|   1: [Class] Test
#    2|     2: [Method] foo
#    2|       3: [TypeAccess] void
#-----|       4: (Parameters)
#    2|         0: [Parameter] s
#    2|           0: [TypeAccess] String
#    2|       5: [BlockStmt] { ... }
#    3|         0: [LocalVariableDeclStmt] var ...;
#    3|           0: [TypeAccess] int
#    3|           1: [LocalVariableDeclExpr] x
#    3|             0: [SwitchExpr] switch (...)
#    3|               -1: [VarAccess] s
#    4|               0: [ConstCase] case ...
#    4|                 -1: [IntegerLiteral] 1
#    4|                 0: [StringLiteral] "a"
#    4|                 1: [StringLiteral] "b"
#    5|               1: [ConstCase] case ...
#    5|                 -1: [IntegerLiteral] 2
#    5|                 0: [StringLiteral] "c"
#    6|               2: [ConstCase] case ...
#    6|                 -1: [IntegerLiteral] 2
#    6|                 0: [StringLiteral] "d"
#    7|               3: [DefaultCase] default
#    7|                 -1: [IntegerLiteral] 3
#    9|         1: [SwitchStmt] switch (...)
#    9|           -1: [VarAccess] s
#   10|           0: [ConstCase] case ...
#   10|             -1: [BlockStmt] { ... }
#   10|             0: [StringLiteral] "a"
#   10|             1: [StringLiteral] "b"
#   11|           1: [ConstCase] case ...
#   11|             -1: [BlockStmt] { ... }
#   11|             0: [StringLiteral] "c"
#   12|           2: [ConstCase] case ...
#   12|             -1: [BlockStmt] { ... }
#   12|             0: [StringLiteral] "d"
#   13|           3: [DefaultCase] default
#   13|             -1: [BlockStmt] { ... }