JetFile: nullableTypes.kt
  PACKAGE_DIRECTIVE
    <empty list>
  IMPORT_LIST
    <empty list>
  FUN
    PsiElement(fun)('fun')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('test')
    VALUE_PARAMETER_LIST
      PsiElement(LPAR)('(')
      PsiElement(RPAR)(')')
    PsiWhiteSpace(' ')
    BLOCK
      PsiElement(LBRACE)('{')
      PsiWhiteSpace('\n    ')
      BINARY_EXPRESSION
        BINARY_WITH_TYPE
          REFERENCE_EXPRESSION
            PsiElement(IDENTIFIER)('x')
          PsiWhiteSpace(' ')
          OPERATION_REFERENCE
            PsiElement(AS_SAFE)('as?')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('X')
        PsiWhiteSpace(' ')
        OPERATION_REFERENCE
          PsiElement(ELVIS)('?:')
        PsiWhiteSpace(' ')
        RETURN
          PsiElement(return)('return')
      PsiWhiteSpace('\n    ')
      BINARY_EXPRESSION
        BINARY_WITH_TYPE
          REFERENCE_EXPRESSION
            PsiElement(IDENTIFIER)('x')
          PsiWhiteSpace(' ')
          OPERATION_REFERENCE
            PsiElement(as)('as')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            NULLABLE_TYPE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('X')
              PsiElement(QUEST)('?')
        PsiWhiteSpace(' ')
        OPERATION_REFERENCE
          PsiElement(ELVIS)('?:')
        PsiWhiteSpace(' ')
        RETURN
          PsiElement(return)('return')
      PsiWhiteSpace('\n\n    ')
      CALLABLE_REFERENCE_EXPRESSION
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('X')
        PsiElement(QUEST)('?')
        PsiElement(COLONCOLON)('::')
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('x')
      PsiWhiteSpace('\n    ')
      CALLABLE_REFERENCE_EXPRESSION
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('X')
        PsiWhiteSpace(' ')
        PsiElement(QUEST)('?')
        PsiElement(COLONCOLON)('::')
        PsiWhiteSpace(' ')
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('x')
      PsiWhiteSpace('\n    ')
      CALLABLE_REFERENCE_EXPRESSION
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('X')
        PsiElement(QUEST)('?')
        PsiWhiteSpace(' ')
        PsiElement(QUEST)('?')
        PsiElement(COLONCOLON)('::')
        PsiWhiteSpace(' ')
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('x')
      PsiWhiteSpace('\n    ')
      CALLABLE_REFERENCE_EXPRESSION
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('X')
        PsiWhiteSpace(' ')
        PsiElement(QUEST)('?')
        PsiElement(QUEST)('?')
        PsiElement(COLONCOLON)('::')
        PsiWhiteSpace(' ')
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('x')
      PsiWhiteSpace('\n    ')
      CALLABLE_REFERENCE_EXPRESSION
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('X')
        PsiWhiteSpace(' ')
        PsiElement(QUEST)('?')
        PsiElement(QUEST)('?')
        PsiWhiteSpace(' ')
        PsiElement(COLONCOLON)('::')
        PsiWhiteSpace(' ')
        REFERENCE_EXPRESSION
          PsiElement(IDENTIFIER)('x')
      PsiWhiteSpace('\n\n    ')
      PROPERTY
        PsiElement(val)('val')
        PsiWhiteSpace(' ')
        PsiElement(IDENTIFIER)('x')
        PsiElement(COLON)(':')
        PsiWhiteSpace(' ')
        TYPE_REFERENCE
          FUNCTION_TYPE
            FUNCTION_TYPE_RECEIVER
              TYPE_REFERENCE
                NULLABLE_TYPE
                  USER_TYPE
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('X')
                  PsiElement(QUEST)('?')
            PsiElement(DOT)('.')
            VALUE_PARAMETER_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
            PsiWhiteSpace(' ')
            PsiElement(ARROW)('->')
            PsiWhiteSpace(' ')
            TYPE_REFERENCE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('Unit')
      PsiWhiteSpace('\n    ')
      PROPERTY
        PsiElement(val)('val')
        PsiWhiteSpace(' ')
        PsiElement(IDENTIFIER)('x')
        PsiElement(COLON)(':')
        PsiWhiteSpace(' ')
        TYPE_REFERENCE
          FUNCTION_TYPE
            FUNCTION_TYPE_RECEIVER
              TYPE_REFERENCE
                NULLABLE_TYPE
                  NULLABLE_TYPE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('X')
                    PsiElement(QUEST)('?')
                  PsiElement(QUEST)('?')
            PsiElement(DOT)('.')
            VALUE_PARAMETER_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
            PsiWhiteSpace(' ')
            PsiElement(ARROW)('->')
            PsiWhiteSpace(' ')
            TYPE_REFERENCE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('Unit')
      PsiWhiteSpace('\n    ')
      PROPERTY
        PsiElement(val)('val')
        PsiWhiteSpace(' ')
        PsiElement(IDENTIFIER)('x')
        PsiElement(COLON)(':')
        PsiWhiteSpace(' ')
        TYPE_REFERENCE
          FUNCTION_TYPE
            FUNCTION_TYPE_RECEIVER
              TYPE_REFERENCE
                NULLABLE_TYPE
                  NULLABLE_TYPE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('X')
                    PsiElement(QUEST)('?')
                  PsiElement(QUEST)('?')
            PsiWhiteSpace(' ')
            PsiElement(DOT)('.')
            VALUE_PARAMETER_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
            PsiWhiteSpace(' ')
            PsiElement(ARROW)('->')
            PsiWhiteSpace(' ')
            TYPE_REFERENCE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('Unit')
      PsiWhiteSpace('\n    ')
      PROPERTY
        PsiElement(val)('val')
        PsiWhiteSpace(' ')
        PsiElement(IDENTIFIER)('x')
        PsiElement(COLON)(':')
        PsiWhiteSpace(' ')
        TYPE_REFERENCE
          FUNCTION_TYPE
            FUNCTION_TYPE_RECEIVER
              TYPE_REFERENCE
                NULLABLE_TYPE
                  USER_TYPE
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('X')
                  PsiWhiteSpace(' ')
                  PsiElement(QUEST)('?')
            PsiWhiteSpace(' ')
            PsiElement(DOT)('.')
            VALUE_PARAMETER_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
            PsiWhiteSpace(' ')
            PsiElement(ARROW)('->')
            PsiWhiteSpace(' ')
            TYPE_REFERENCE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('Unit')
      PsiWhiteSpace('\n    ')
      PROPERTY
        PsiElement(val)('val')
        PsiWhiteSpace(' ')
        PsiElement(IDENTIFIER)('x')
        PsiElement(COLON)(':')
        PsiWhiteSpace(' ')
        TYPE_REFERENCE
          FUNCTION_TYPE
            FUNCTION_TYPE_RECEIVER
              TYPE_REFERENCE
                NULLABLE_TYPE
                  USER_TYPE
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('X')
                  PsiWhiteSpace(' ')
                  PsiElement(QUEST)('?')
            PsiElement(DOT)('.')
            VALUE_PARAMETER_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
            PsiWhiteSpace(' ')
            PsiElement(ARROW)('->')
            PsiWhiteSpace(' ')
            TYPE_REFERENCE
              USER_TYPE
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('Unit')
      PsiWhiteSpace('\n')
      PsiElement(RBRACE)('}')