a.kt:
#    0| [CompilationUnit] a
#    1|   1: [Class] A
#    0|     1: [Method] <fn>
#    0|       3: [TypeAccess] int
#    0|       5: [BlockStmt] { ... }
#    0|         0: [ReturnStmt] return ...
#    0|           0: [IntegerLiteral] 42
#    1|     2: [Constructor] A
#    1|       5: [BlockStmt] { ... }
#    1|         0: [SuperConstructorInvocationStmt] super(...)
#    1|         1: [BlockStmt] { ... }
#    2|     3: [Method] f1
#    2|       3: [TypeAccess] int
#    2|       5: [BlockStmt] { ... }
#    2|         0: [ReturnStmt] return ...
#    2|           0: [IntegerLiteral] 1
b.kt:
#    0| [CompilationUnit] b
#    1|   1: [Class] B
#    0|     1: [Method] <fn>
#    0|       3: [TypeAccess] int
#    0|       5: [BlockStmt] { ... }
#    0|         0: [ReturnStmt] return ...
#    0|           0: [UnsafeCoerceExpr] <unsafe coerce>
#    0|             0: [TypeAccess] int
#    0|             1: [IntegerLiteral] 1
#    1|     2: [Constructor] B
#    1|       5: [BlockStmt] { ... }
#    1|         0: [SuperConstructorInvocationStmt] super(...)
#    1|         1: [BlockStmt] { ... }
c.kt:
#    0| [CompilationUnit] c
#    1|   1: [Class] C
#    0|     1: [Method] <fn>
#    0|       3: [TypeAccess] Unit
#-----|       4: (Parameters)
#    0|         0: [Parameter] param
#    0|           0: [TypeAccess] ProcessBuilder
#    0|       5: [BlockStmt] { ... }
#    0|         0: [ReturnStmt] return ...
#    0|           0: [MethodCall] start(...)
#    0|             -1: [VarAccess] param
#    1|     2: [Constructor] C
#    1|       5: [BlockStmt] { ... }
#    1|         0: [SuperConstructorInvocationStmt] super(...)
#    1|         1: [BlockStmt] { ... }
d.kt:
#    0| [CompilationUnit] d
#    1|   1: [Class] D
#    0|     2: [FieldDeclaration] String bar;
#    0|       -1: [TypeAccess] String
#    0|       0: [StringLiteral] "Foobar"
#    1|     3: [Constructor] D
#    1|       5: [BlockStmt] { ... }
#    1|         0: [SuperConstructorInvocationStmt] super(...)
#    1|         1: [BlockStmt] { ... }
e.kt:
#    0| [CompilationUnit] e
#    1|   1: [Class] E
#    0|     1: [Method] <fn_ArrayListAdd>
#    0|       3: [TypeAccess] boolean
#    0|       5: [BlockStmt] { ... }
#    0|         0: [ReturnStmt] return ...
#    0|           0: [MethodCall] add(...)
#    0|             -1: [ClassInstanceExpr] new ArrayList<Object>(...)
#    0|               -3: [TypeAccess] ArrayList<Object>
#    0|               0: [IntegerLiteral] 1
#    0|             0: [NullLiteral] null
#    0|     2: [Method] <fn_LinkedHashMap>
#    0|       3: [TypeAccess] Object
#    0|       5: [BlockStmt] { ... }
#    0|         0: [ReturnStmt] return ...
#    0|           0: [MethodCall] put(...)
#    0|             -1: [ClassInstanceExpr] new LinkedHashMap<Object,Object>(...)
#    0|               -3: [TypeAccess] LinkedHashMap<Object,Object>
#    0|               0: [IntegerLiteral] 1
#    0|             0: [NullLiteral] null
#    0|             1: [NullLiteral] null
#    1|     3: [Constructor] E
#    1|       5: [BlockStmt] { ... }
#    1|         0: [SuperConstructorInvocationStmt] super(...)
#    1|         1: [BlockStmt] { ... }