JetFile: BinaryTree.jet
  NAMESPACE
    CLASS
      PsiElement(class)('class')
      PsiWhiteSpace(' ')
      PsiElement(IDENTIFIER)('BinaryTree')
      TYPE_PARAMETER_LIST
        PsiElement(LT)('<')
        TYPE_PARAMETER
          PsiElement(IDENTIFIER)('T')
        PsiElement(GT)('>')
      PsiWhiteSpace(' ')
      PsiElement(COLON)(':')
      PsiWhiteSpace(' ')
      DELEGATION_SPECIFIER_LIST
        DELEGATOR_SUPER_CLASS
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('IMutableSet')
              TYPE_ARGUMENT_LIST
                PsiElement(LT)('<')
                TYPE_PROJECTION
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                PsiElement(GT)('>')
      PsiWhiteSpace(' ')
      CLASS_BODY
        PsiElement(LBRACE)('{')
        PsiWhiteSpace('\n  ')
        CLASS
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(class)('class')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('TreeNode')
          TYPE_PARAMETER_LIST
            <empty list>
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            PsiWhiteSpace('\n    ')
            VALUE_PARAMETER
              PsiElement(var)('var')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('value')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('T')
            PsiElement(COMMA)(',')
            PsiWhiteSpace(' ')
            VALUE_PARAMETER
              PsiElement(var)('var')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('parent')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
            PsiWhiteSpace('\n  ')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          CLASS_BODY
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            PROPERTY
              PsiElement(var)('var')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('left')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
            PsiWhiteSpace('\n    ')
            PROPERTY
              PsiElement(var)('var')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('right')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
            PsiWhiteSpace('\n\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        PROPERTY
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(val)('val')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('compare')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('MatchableComparison')
              TYPE_ARGUMENT_LIST
                PsiElement(LT)('<')
                TYPE_PROJECTION
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                PsiElement(GT)('>')
        PsiWhiteSpace('\n  ')
        PROPERTY
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(var)('var')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('root')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('TreeNode')
        PsiWhiteSpace('\n  ')
        PROPERTY
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(var)('var')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('version')
          PsiWhiteSpace(' ')
          PsiElement(EQ)('=')
          PsiWhiteSpace(' ')
          INTEGER_CONSTANT
            PsiElement(INTEGER_LITERAL)('0')
        PsiWhiteSpace('\n\n')
        PsiComment(EOL_COMMENT)('//  override var size : Int { get; private set; }')
        PsiWhiteSpace('\n\n  ')
        CONSTRUCTOR
          PsiElement(this)('this')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('compare')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('Comparison')
                  TYPE_ARGUMENT_LIST
                    PsiElement(LT)('<')
                    TYPE_PROJECTION
                      TYPE_REFERENCE
                        USER_TYPE
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('T')
                    PsiElement(GT)('>')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            BINARY_EXPRESSION
              DOT_QUALIFIED_EXPRESSION
                THIS_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(this)('this')
                PsiElement(DOT)('.')
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('compare')
              PsiWhiteSpace(' ')
              OPERATION_REFERENCE
                PsiElement(EQ)('=')
              PsiWhiteSpace(' ')
              CALL_EXPRESSION
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('asMatchableComparison')
                VALUE_ARGUMENT_LIST
                  PsiElement(LPAR)('(')
                  VALUE_ARGUMENT
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('comparison')
                  PsiElement(RPAR)(')')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        CONSTRUCTOR
          PsiElement(this)('this')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          INITIALIZER_LIST
            THIS_CALL
              THIS_CONSTRUCTOR_REFERENCE
                PsiElement(this)('this')
              VALUE_ARGUMENT_LIST
                PsiElement(LPAR)('(')
                VALUE_ARGUMENT
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('naturalOrder')
                    TYPE_ARGUMENT_LIST
                      PsiElement(LT)('<')
                      TYPE_PROJECTION
                        TYPE_REFERENCE
                          USER_TYPE
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('T')
                      PsiElement(GT)('>')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      PsiElement(RPAR)(')')
                PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(private)('private')
            PsiWhiteSpace(' ')
            ANNOTATION
              PsiElement(LBRACKET)('[')
              ANNOTATION_ENTRY
                CONSTRUCTOR_CALLEE
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('operator')
              PsiElement(RBRACKET)(']')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('T')
          PsiElement(DOT)('.')
          PsiElement(IDENTIFIER)('compareTo')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('other')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('T')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('Int')
          PsiWhiteSpace(' ')
          PsiElement(EQ)('=')
          PsiWhiteSpace(' ')
          CALL_EXPRESSION
            REFERENCE_EXPRESSION
              PsiElement(IDENTIFIER)('compare')
            VALUE_ARGUMENT_LIST
              PsiElement(LPAR)('(')
              VALUE_ARGUMENT
                THIS_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(this)('this')
              PsiElement(COMMA)(',')
              PsiWhiteSpace(' ')
              VALUE_ARGUMENT
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('other')
              PsiElement(RPAR)(')')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(override)('override')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('contains')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('item')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('T')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('Boolean')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            RETURN
              PsiElement(return)('return')
              PsiWhiteSpace(' ')
              CALL_EXPRESSION
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('contains')
                VALUE_ARGUMENT_LIST
                  PsiElement(LPAR)('(')
                  VALUE_ARGUMENT
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('root')
                  PsiElement(COMMA)(',')
                  PsiWhiteSpace(' ')
                  VALUE_ARGUMENT
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('item')
                  PsiElement(RPAR)(')')
            PsiWhiteSpace('\n\n    ')
            FUN
              PsiElement(fun)('fun')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('contains')
              VALUE_PARAMETER_LIST
                PsiElement(LPAR)('(')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(COMMA)(',')
                PsiWhiteSpace(' ')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('item')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('Boolean')
              PsiWhiteSpace(' ')
              BLOCK
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      NULL
                        PsiElement(null)('null')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    RETURN
                      PsiElement(return)('return')
                      PsiWhiteSpace(' ')
                      BOOLEAN_CONSTANT
                        PsiElement(false)('false')
                PsiWhiteSpace('\n      ')
                WHEN
                  PsiElement(when)('when')
                  PsiElement(LPAR)('(')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('compare')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      VALUE_ARGUMENT
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('item')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      VALUE_ARGUMENT
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('value')
                      PsiElement(RPAR)(')')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('EQ')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    BOOLEAN_CONSTANT
                      PsiElement(true)('true')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('LS')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('contains')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('left')
                        PsiElement(COMMA)(',')
                        PsiWhiteSpace(' ')
                        VALUE_ARGUMENT
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('item')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('GT')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('contains')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                        PsiElement(COMMA)(',')
                        PsiWhiteSpace(' ')
                        VALUE_ARGUMENT
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('item')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n      ')
                  PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n    ')
                PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(override)('override')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('add')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('item')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('T')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('Boolean')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            IF
              PsiElement(if)('if')
              PsiWhiteSpace(' ')
              PsiElement(LPAR)('(')
              CONDITION
                CALL_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('add')
                  VALUE_ARGUMENT_LIST
                    PsiElement(LPAR)('(')
                    VALUE_ARGUMENT
                      PsiElement(ref)('ref')
                      PsiWhiteSpace(' ')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('root')
                    PsiElement(COMMA)(',')
                    PsiWhiteSpace(' ')
                    VALUE_ARGUMENT
                      NULL
                        PsiElement(null)('null')
                    PsiElement(RPAR)(')')
              PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              THEN
                BLOCK
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n      ')
                  POSTFIX_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('size')
                    OPERATION_REFERENCE
                      PsiElement(PLUSPLUS)('++')
                  PsiWhiteSpace('\n      ')
                  POSTFIX_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('version')
                    OPERATION_REFERENCE
                      PsiElement(PLUSPLUS)('++')
                  PsiWhiteSpace('\n      ')
                  RETURN
                    PsiElement(return)('return')
                    PsiWhiteSpace(' ')
                    BOOLEAN_CONSTANT
                      PsiElement(true)('true')
                  PsiWhiteSpace('\n    ')
                  PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n    ')
            RETURN
              PsiElement(return)('return')
              PsiWhiteSpace(' ')
              BOOLEAN_CONSTANT
                PsiElement(false)('false')
            PsiWhiteSpace('\n\n    ')
            PsiComment(EOL_COMMENT)('// In principle, this has access to item anyway, but then it's unreachable code')
            PsiWhiteSpace('\n    ')
            PsiComment(EOL_COMMENT)('// BAD: the naive implementation of ref will create H(T) ref objects, but can be optimized to create only one')
            PsiWhiteSpace('\n    ')
            FUN
              PsiElement(fun)('fun')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('add')
              VALUE_PARAMETER_LIST
                PsiElement(LPAR)('(')
                VALUE_PARAMETER
                  MODIFIER_LIST
                    PsiElement(ref)('ref')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(COMMA)(',')
                PsiWhiteSpace(' ')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('parent')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('Boolean')
              PsiWhiteSpace(' ')
              BLOCK
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      NULL
                        PsiElement(null)('null')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    BLOCK
                      PsiElement(LBRACE)('{')
                      PsiWhiteSpace('\n        ')
                      BINARY_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('node')
                        PsiWhiteSpace(' ')
                        OPERATION_REFERENCE
                          PsiElement(EQ)('=')
                        PsiWhiteSpace(' ')
                        CALL_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('TreeNode')
                          VALUE_ARGUMENT_LIST
                            PsiElement(LPAR)('(')
                            VALUE_ARGUMENT
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('item')
                            PsiElement(COMMA)(',')
                            PsiWhiteSpace(' ')
                            VALUE_ARGUMENT
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('parent')
                            PsiElement(RPAR)(')')
                      PsiWhiteSpace('\n        ')
                      RETURN
                        PsiElement(return)('return')
                        PsiWhiteSpace(' ')
                        BOOLEAN_CONSTANT
                          PsiElement(true)('true')
                      PsiWhiteSpace('\n      ')
                      PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n      ')
                WHEN
                  PsiElement(when)('when')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('compare')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      VALUE_ARGUMENT
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('item')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      VALUE_ARGUMENT
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('value')
                      PsiElement(RPAR)(')')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('EQ')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    BOOLEAN_CONSTANT
                      PsiElement(false)('false')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('LS')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('add')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          PsiElement(ref)('ref')
                          PsiWhiteSpace(' ')
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('left')
                        PsiElement(COMMA)(',')
                        PsiWhiteSpace(' ')
                        VALUE_ARGUMENT
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('GT')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('add')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          PsiElement(ref)('ref')
                          PsiWhiteSpace(' ')
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                        PsiElement(COMMA)(',')
                        PsiWhiteSpace(' ')
                        VALUE_ARGUMENT
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n      ')
                  PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n    ')
                PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n\n    ')
            PsiComment(EOL_COMMENT)('// In principle, this has access to item anyway')
            PsiWhiteSpace('\n    ')
            FUN
              PsiElement(fun)('fun')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('addNoRef')
              VALUE_PARAMETER_LIST
                PsiElement(LPAR)('(')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('Boolean')
              PsiWhiteSpace(' ')
              BLOCK
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      NULL
                        PsiElement(null)('null')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    BLOCK
                      PsiElement(LBRACE)('{')
                      PsiWhiteSpace('\n        ')
                      BINARY_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('root')
                        PsiWhiteSpace(' ')
                        OPERATION_REFERENCE
                          PsiElement(EQ)('=')
                        PsiWhiteSpace(' ')
                        CALL_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('TreeNode')
                          VALUE_ARGUMENT_LIST
                            PsiElement(LPAR)('(')
                            VALUE_ARGUMENT
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('item')
                            PsiElement(COMMA)(',')
                            PsiWhiteSpace(' ')
                            VALUE_ARGUMENT
                              NULL
                                PsiElement(null)('null')
                            PsiElement(RPAR)(')')
                      PsiWhiteSpace('\n        ')
                      RETURN
                        PsiElement(return)('return')
                        PsiWhiteSpace(' ')
                        BOOLEAN_CONSTANT
                          PsiElement(true)('true')
                      PsiWhiteSpace('\n      ')
                      PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n      ')
                WHEN
                  PsiElement(when)('when')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('compare')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      VALUE_ARGUMENT
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('item')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      VALUE_ARGUMENT
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('value')
                      PsiElement(RPAR)(')')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('EQ')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    RETURN
                      PsiElement(return)('return')
                      PsiWhiteSpace(' ')
                      BOOLEAN_CONSTANT
                        PsiElement(false)('false')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('LS')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace('\n          ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('left')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EQEQ)('==')
                          PsiWhiteSpace(' ')
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace(' ')
                      THEN
                        BLOCK
                          PsiElement(LBRACE)('{')
                          PsiWhiteSpace('\n            ')
                          BINARY_EXPRESSION
                            DOT_QUALIFIED_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('node')
                              PsiElement(DOT)('.')
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('left')
                            PsiWhiteSpace(' ')
                            OPERATION_REFERENCE
                              PsiElement(EQ)('=')
                            PsiWhiteSpace(' ')
                            CALL_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('TreeNode')
                              VALUE_ARGUMENT_LIST
                                PsiElement(LPAR)('(')
                                VALUE_ARGUMENT
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('item')
                                PsiElement(COMMA)(',')
                                PsiWhiteSpace(' ')
                                VALUE_ARGUMENT
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('node')
                                PsiElement(RPAR)(')')
                          PsiWhiteSpace('\n            ')
                          RETURN
                            PsiElement(return)('return')
                            PsiWhiteSpace(' ')
                            BOOLEAN_CONSTANT
                              PsiElement(true)('true')
                          PsiWhiteSpace('\n          ')
                          PsiElement(RBRACE)('}')
                      PsiWhiteSpace(' ')
                      PsiElement(else)('else')
                      PsiWhiteSpace(' ')
                      ELSE
                        RETURN
                          PsiElement(return)('return')
                          PsiWhiteSpace(' ')
                          CALL_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('add')
                            VALUE_ARGUMENT_LIST
                              PsiElement(LPAR)('(')
                              VALUE_ARGUMENT
                                DOT_QUALIFIED_EXPRESSION
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('node')
                                  PsiElement(DOT)('.')
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('left')
                              PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('GT')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace('\n          ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EQEQ)('==')
                          PsiWhiteSpace(' ')
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace(' ')
                      THEN
                        BLOCK
                          PsiElement(LBRACE)('{')
                          PsiWhiteSpace('\n            ')
                          BINARY_EXPRESSION
                            DOT_QUALIFIED_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('node')
                              PsiElement(DOT)('.')
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('right')
                            PsiWhiteSpace(' ')
                            OPERATION_REFERENCE
                              PsiElement(EQ)('=')
                            PsiWhiteSpace(' ')
                            CALL_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('TreeNode')
                              VALUE_ARGUMENT_LIST
                                PsiElement(LPAR)('(')
                                VALUE_ARGUMENT
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('item')
                                PsiElement(COMMA)(',')
                                PsiWhiteSpace(' ')
                                VALUE_ARGUMENT
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('node')
                                PsiElement(RPAR)(')')
                          PsiWhiteSpace('\n            ')
                          RETURN
                            PsiElement(return)('return')
                            PsiWhiteSpace(' ')
                            BOOLEAN_CONSTANT
                              PsiElement(true)('true')
                          PsiWhiteSpace('\n          ')
                          PsiElement(RBRACE)('}')
                      PsiWhiteSpace(' ')
                      PsiElement(else)('else')
                      PsiWhiteSpace(' ')
                      ELSE
                        RETURN
                          PsiElement(return)('return')
                          PsiWhiteSpace(' ')
                          CALL_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('add')
                            VALUE_ARGUMENT_LIST
                              PsiElement(LPAR)('(')
                              VALUE_ARGUMENT
                                DOT_QUALIFIED_EXPRESSION
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('node')
                                  PsiElement(DOT)('.')
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('right')
                              PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n      ')
                  PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n    ')
                PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(override)('override')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('remove')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('item')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('T')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('Boolean')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            PROPERTY
              PsiElement(val)('val')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('toRemove')
              PsiWhiteSpace(' ')
              PsiElement(EQ)('=')
              PsiWhiteSpace(' ')
              CALL_EXPRESSION
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('find')
                VALUE_ARGUMENT_LIST
                  PsiElement(LPAR)('(')
                  VALUE_ARGUMENT
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('root')
                  PsiElement(COMMA)(',')
                  PsiWhiteSpace(' ')
                  VALUE_ARGUMENT
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('item')
                  PsiElement(RPAR)(')')
            PsiWhiteSpace('\n    ')
            IF
              PsiElement(if)('if')
              PsiWhiteSpace(' ')
              PsiElement(LPAR)('(')
              CONDITION
                BINARY_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('toRemove')
                  PsiWhiteSpace(' ')
                  OPERATION_REFERENCE
                    PsiElement(EQEQ)('==')
                  PsiWhiteSpace(' ')
                  NULL
                    PsiElement(null)('null')
              PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              THEN
                RETURN
                  PsiElement(return)('return')
                  PsiWhiteSpace(' ')
                  BOOLEAN_CONSTANT
                    PsiElement(false)('false')
            PsiWhiteSpace('\n    ')
            CALL_EXPRESSION
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('remove')
              VALUE_ARGUMENT_LIST
                PsiElement(LPAR)('(')
                VALUE_ARGUMENT
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('toRemove')
                PsiElement(RPAR)(')')
            PsiWhiteSpace('\n    ')
            POSTFIX_EXPRESSION
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('size')
              OPERATION_REFERENCE
                PsiElement(MINUSMINUS)('--')
            PsiWhiteSpace('\n    ')
            POSTFIX_EXPRESSION
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('version')
              OPERATION_REFERENCE
                PsiElement(PLUSPLUS)('++')
            PsiWhiteSpace('\n    ')
            RETURN
              PsiElement(return)('return')
              PsiWhiteSpace(' ')
              BOOLEAN_CONSTANT
                PsiElement(true)('true')
            PsiWhiteSpace('\n\n    ')
            FUN
              PsiElement(fun)('fun')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('find')
              VALUE_PARAMETER_LIST
                PsiElement(LPAR)('(')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
              PsiWhiteSpace(' ')
              BLOCK
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      NULL
                        PsiElement(null)('null')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    RETURN
                      PsiElement(return)('return')
                      PsiWhiteSpace(' ')
                      NULL
                        PsiElement(null)('null')
                PsiWhiteSpace('\n      ')
                WHEN
                  PsiElement(when)('when')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('compare')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      VALUE_ARGUMENT
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('item')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      VALUE_ARGUMENT
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('value')
                      PsiElement(RPAR)(')')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('EQ')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('LS')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('find')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('left')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n        ')
                  WHEN_ENTRY
                    WHEN_CONDITION_IS_PATTERN
                      EXPRESSION_PATTERN
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('GT')
                    PsiWhiteSpace(' ')
                    PsiElement(DOUBLE_ARROW)('=>')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('find')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n      ')
                  PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n    ')
                PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('remove')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('node')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            WHEN
              PsiElement(when)('when')
              PsiWhiteSpace(' ')
              PsiElement(LPAR)('(')
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('node')
              PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              PsiElement(LBRACE)('{')
              PsiWhiteSpace('\n      ')
              WHEN_ENTRY
                WHEN_CONDITION_IS_PATTERN
                  PsiElement(is)('is')
                  PsiWhiteSpace(' ')
                  DECOMPOSER_PATTERN
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('TreeNode')
                    PsiWhiteSpace(' ')
                    PsiElement(AT)('@')
                    PsiWhiteSpace(' ')
                    DECOMPOSER_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      TUPLE_PATTERN_ENTRY
                        EXPRESSION_PATTERN
                          NULL
                            PsiElement(null)('null')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      TUPLE_PATTERN_ENTRY
                        EXPRESSION_PATTERN
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace(' ')
                PsiElement(DOUBLE_ARROW)('=>')
                PsiWhiteSpace(' ')
                CALL_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('replace')
                  VALUE_ARGUMENT_LIST
                    PsiElement(LPAR)('(')
                    VALUE_ARGUMENT
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                    PsiElement(COMMA)(',')
                    PsiWhiteSpace(' ')
                    VALUE_ARGUMENT
                      NULL
                        PsiElement(null)('null')
                    PsiElement(RPAR)(')')
              PsiWhiteSpace('\n      ')
              WHEN_ENTRY
                WHEN_CONDITION_IS_PATTERN
                  PsiElement(is)('is')
                  PsiWhiteSpace(' ')
                  DECOMPOSER_PATTERN
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('TreeNode')
                    PsiWhiteSpace(' ')
                    PsiElement(AT)('@')
                    PsiWhiteSpace(' ')
                    DECOMPOSER_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      TUPLE_PATTERN_ENTRY
                        EXPRESSION_PATTERN
                          NULL
                            PsiElement(null)('null')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      TUPLE_PATTERN_ENTRY
                        TYPE_PATTERN
                          TYPE_REFERENCE
                            USER_TYPE
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('right')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace(' ')
                PsiElement(DOUBLE_ARROW)('=>')
                PsiWhiteSpace(' ')
                CALL_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('replace')
                  VALUE_ARGUMENT_LIST
                    PsiElement(LPAR)('(')
                    VALUE_ARGUMENT
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                    PsiElement(COMMA)(',')
                    PsiWhiteSpace(' ')
                    VALUE_ARGUMENT
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('right')
                    PsiElement(RPAR)(')')
              PsiWhiteSpace('\n      ')
              WHEN_ENTRY
                WHEN_CONDITION_IS_PATTERN
                  PsiElement(is)('is')
                  PsiWhiteSpace(' ')
                  DECOMPOSER_PATTERN
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('TreeNode')
                    PsiWhiteSpace(' ')
                    PsiElement(AT)('@')
                    PsiWhiteSpace(' ')
                    DECOMPOSER_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      TUPLE_PATTERN_ENTRY
                        TYPE_PATTERN
                          TYPE_REFERENCE
                            USER_TYPE
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('left')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      TUPLE_PATTERN_ENTRY
                        EXPRESSION_PATTERN
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace(' ')
                PsiElement(DOUBLE_ARROW)('=>')
                PsiWhiteSpace(' ')
                CALL_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('replace')
                  VALUE_ARGUMENT_LIST
                    PsiElement(LPAR)('(')
                    VALUE_ARGUMENT
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                    PsiElement(COMMA)(',')
                    PsiWhiteSpace(' ')
                    VALUE_ARGUMENT
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('left')
                    PsiElement(RPAR)(')')
              PsiWhiteSpace('\n      ')
              WHEN_ENTRY
                WHEN_CONDITION_IS_PATTERN
                  PsiElement(is)('is')
                  PsiWhiteSpace(' ')
                  DECOMPOSER_PATTERN
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('TreeNode')
                    PsiWhiteSpace(' ')
                    PsiElement(AT)('@')
                    PsiWhiteSpace(' ')
                    DECOMPOSER_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      TUPLE_PATTERN_ENTRY
                        TYPE_PATTERN
                          TYPE_REFERENCE
                            USER_TYPE
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('left')
                      PsiElement(COMMA)(',')
                      PsiWhiteSpace(' ')
                      TUPLE_PATTERN_ENTRY
                        TYPE_PATTERN
                          TYPE_REFERENCE
                            USER_TYPE
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('right')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace(' ')
                PsiElement(DOUBLE_ARROW)('=>')
                PsiWhiteSpace(' ')
                BLOCK
                  PsiElement(LBRACE)('{')
                  PsiWhiteSpace('\n        ')
                  PROPERTY
                    PsiElement(val)('val')
                    PsiWhiteSpace(' ')
                    PsiElement(IDENTIFIER)('min')
                    PsiWhiteSpace(' ')
                    PsiElement(EQ)('=')
                    PsiWhiteSpace(' ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('min')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                        PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n        ')
                  BINARY_EXPRESSION
                    DOT_QUALIFIED_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiElement(DOT)('.')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('value')
                    PsiWhiteSpace(' ')
                    OPERATION_REFERENCE
                      PsiElement(EQ)('=')
                    PsiWhiteSpace(' ')
                    DOT_QUALIFIED_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('min')
                      PsiElement(DOT)('.')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('value')
                  PsiWhiteSpace('\n        ')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('remove')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      VALUE_ARGUMENT
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('min')
                      PsiElement(RPAR)(')')
                  PsiWhiteSpace('\n      ')
                  PsiElement(RBRACE)('}')
              PsiWhiteSpace('\n    ')
              PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n\n    ')
            FUN
              PsiElement(fun)('fun')
              PsiWhiteSpace(' ')
              PsiElement(IDENTIFIER)('replace')
              VALUE_PARAMETER_LIST
                PsiElement(LPAR)('(')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('node')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(COMMA)(',')
                PsiWhiteSpace(' ')
                VALUE_PARAMETER
                  PsiElement(IDENTIFIER)('replace')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              BLOCK
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('root')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    BLOCK
                      PsiElement(LBRACE)('{')
                      PsiWhiteSpace('\n        ')
                      BINARY_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('root')
                        PsiWhiteSpace(' ')
                        OPERATION_REFERENCE
                          PsiElement(EQ)('=')
                        PsiWhiteSpace(' ')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('replace')
                      PsiWhiteSpace('\n        ')
                      RETURN
                        PsiElement(return)('return')
                      PsiWhiteSpace('\n      ')
                      PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n      ')
                IF
                  PsiElement(if)('if')
                  PsiWhiteSpace(' ')
                  PsiElement(LPAR)('(')
                  CONDITION
                    BINARY_EXPRESSION
                      DOT_QUALIFIED_EXPRESSION
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('parent')
                        PsiElement(DOT)('.')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('left')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQEQ)('==')
                      PsiWhiteSpace(' ')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('node')
                  PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  THEN
                    BLOCK
                      PsiElement(LBRACE)('{')
                      PsiWhiteSpace('\n        ')
                      BINARY_EXPRESSION
                        DOT_QUALIFIED_EXPRESSION
                          DOT_QUALIFIED_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('node')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('parent')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('left')
                        PsiWhiteSpace(' ')
                        OPERATION_REFERENCE
                          PsiElement(EQ)('=')
                        PsiWhiteSpace(' ')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('replace')
                      PsiWhiteSpace('\n      ')
                      PsiElement(RBRACE)('}')
                  PsiWhiteSpace(' ')
                  PsiElement(else)('else')
                  PsiWhiteSpace(' ')
                  ELSE
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          DOT_QUALIFIED_EXPRESSION
                            DOT_QUALIFIED_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('node')
                              PsiElement(DOT)('.')
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('parent')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('right')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EQEQ)('==')
                          PsiWhiteSpace(' ')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('node')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace(' ')
                      THEN
                        BLOCK
                          PsiElement(LBRACE)('{')
                          PsiWhiteSpace('\n        ')
                          BINARY_EXPRESSION
                            DOT_QUALIFIED_EXPRESSION
                              DOT_QUALIFIED_EXPRESSION
                                REFERENCE_EXPRESSION
                                  PsiElement(IDENTIFIER)('node')
                                PsiElement(DOT)('.')
                                REFERENCE_EXPRESSION
                                  PsiElement(IDENTIFIER)('parent')
                              PsiElement(DOT)('.')
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('right')
                            PsiWhiteSpace(' ')
                            OPERATION_REFERENCE
                              PsiElement(EQ)('=')
                            PsiWhiteSpace(' ')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('replace')
                          PsiWhiteSpace('\n      ')
                          PsiElement(RBRACE)('}')
                      PsiWhiteSpace(' ')
                      PsiElement(else)('else')
                      PsiWhiteSpace(' ')
                      ELSE
                        CALL_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('Assert')
                          VALUE_ARGUMENT_LIST
                            PsiElement(LPAR)('(')
                            VALUE_ARGUMENT
                              BOOLEAN_CONSTANT
                                PsiElement(false)('false')
                            PsiElement(RPAR)(')')
                PsiWhiteSpace('\n    ')
                PsiElement(RBRACE)('}')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        PsiComment(EOL_COMMENT)('// Relies on tail-recursion optimization')
        PsiWhiteSpace('\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(private)('private')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('min')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            VALUE_PARAMETER
              PsiElement(IDENTIFIER)('node')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              TYPE_REFERENCE
                USER_TYPE
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('TreeNode')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          BLOCK
            PsiElement(LBRACE)('{')
            PsiWhiteSpace('\n    ')
            IF
              PsiElement(if)('if')
              PsiWhiteSpace(' ')
              PsiElement(LPAR)('(')
              CONDITION
                BINARY_EXPRESSION
                  DOT_QUALIFIED_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('node')
                    PsiElement(DOT)('.')
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('left')
                  PsiWhiteSpace(' ')
                  OPERATION_REFERENCE
                    PsiElement(EQEQ)('==')
                  PsiWhiteSpace(' ')
                  NULL
                    PsiElement(null)('null')
              PsiElement(RPAR)(')')
              PsiWhiteSpace(' ')
              THEN
                REFERENCE_EXPRESSION
                  PsiElement(IDENTIFIER)('node')
              PsiWhiteSpace(' ')
              PsiElement(else)('else')
              PsiWhiteSpace(' ')
              ELSE
                CALL_EXPRESSION
                  REFERENCE_EXPRESSION
                    PsiElement(IDENTIFIER)('min')
                  VALUE_ARGUMENT_LIST
                    PsiElement(LPAR)('(')
                    VALUE_ARGUMENT
                      DOT_QUALIFIED_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('node')
                        PsiElement(DOT)('.')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('left')
                    PsiElement(RPAR)(')')
            PsiWhiteSpace('\n  ')
            PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(override)('override')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('iterator')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('IIterator')
              TYPE_ARGUMENT_LIST
                PsiElement(LT)('<')
                TYPE_PROJECTION
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                PsiElement(GT)('>')
          PsiWhiteSpace(' ')
          PsiElement(EQ)('=')
          PsiWhiteSpace(' ')
          CALL_EXPRESSION
            REFERENCE_EXPRESSION
              PsiElement(IDENTIFIER)('mutableIterator')
            VALUE_ARGUMENT_LIST
              PsiElement(LPAR)('(')
              PsiElement(RPAR)(')')
        PsiWhiteSpace('\n\n  ')
        FUN
          MODIFIER_LIST
            PsiElement(override)('override')
          PsiWhiteSpace(' ')
          PsiElement(fun)('fun')
          PsiWhiteSpace(' ')
          PsiElement(IDENTIFIER)('mutableIterator')
          VALUE_PARAMETER_LIST
            PsiElement(LPAR)('(')
            PsiElement(RPAR)(')')
          PsiWhiteSpace(' ')
          PsiElement(COLON)(':')
          PsiWhiteSpace(' ')
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('IMutableIterator')
              TYPE_ARGUMENT_LIST
                PsiElement(LT)('<')
                TYPE_PROJECTION
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                PsiElement(GT)('>')
          PsiWhiteSpace(' ')
          PsiElement(EQ)('=')
          PsiWhiteSpace(' ')
          OBJECT_LITERAL
            OBJECT_DECLARATION
              PsiElement(object)('object')
              PsiWhiteSpace(' ')
              PsiElement(COLON)(':')
              PsiWhiteSpace(' ')
              DELEGATION_SPECIFIER_LIST
                DELEGATOR_SUPER_CLASS
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('IMutableIterator')
              PsiWhiteSpace(' ')
              CLASS_BODY
                PsiElement(LBRACE)('{')
                PsiWhiteSpace('\n    ')
                PROPERTY
                  PsiElement(val)('val')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('version')
                  PsiWhiteSpace(' ')
                  PsiElement(EQ)('=')
                  PsiWhiteSpace(' ')
                  DOT_QUALIFIED_EXPRESSION
                    DOT_QUALIFIED_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('BinaryTree')
                      PsiElement(DOT)('.')
                      THIS_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(this)('this')
                    PsiElement(DOT)('.')
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('version')
                PsiWhiteSpace('\n    ')
                PROPERTY
                  PsiElement(val)('val')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('down')
                  PsiWhiteSpace(' ')
                  PsiElement(EQ)('=')
                  PsiWhiteSpace(' ')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('Stack')
                    TYPE_ARGUMENT_LIST
                      PsiElement(LT)('<')
                      TYPE_PROJECTION
                        TYPE_REFERENCE
                          USER_TYPE
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('TreeNode')
                      PsiElement(GT)('>')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace('\n    ')
                PROPERTY
                  PsiElement(val)('val')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('up')
                  PsiWhiteSpace(' ')
                  PsiElement(EQ)('=')
                  PsiWhiteSpace(' ')
                  CALL_EXPRESSION
                    REFERENCE_EXPRESSION
                      PsiElement(IDENTIFIER)('Stack')
                    TYPE_ARGUMENT_LIST
                      PsiElement(LT)('<')
                      TYPE_PROJECTION
                        TYPE_REFERENCE
                          USER_TYPE
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('TreeNode')
                      PsiElement(GT)('>')
                    VALUE_ARGUMENT_LIST
                      PsiElement(LPAR)('(')
                      PsiElement(RPAR)(')')
                PsiWhiteSpace('\n    ')
                PROPERTY
                  PsiElement(var)('var')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('lastNode')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                PsiWhiteSpace('\n\n    ')
                CONSTRUCTOR
                  PsiElement(this)('this')
                  VALUE_PARAMETER_LIST
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  BLOCK
                    PsiElement(LBRACE)('{')
                    PsiWhiteSpace('\n      ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('root')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EXCLEQ)('!=')
                          PsiWhiteSpace(' ')
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace('\n        ')
                      THEN
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('down')
                          PsiElement(DOT)('.')
                          CALL_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('push')
                            VALUE_ARGUMENT_LIST
                              PsiElement(LPAR)('(')
                              VALUE_ARGUMENT
                                REFERENCE_EXPRESSION
                                  PsiElement(IDENTIFIER)('root')
                              PsiElement(RPAR)(')')
                    PsiWhiteSpace('    \n    ')
                    PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n\n    ')
                FUN
                  MODIFIER_LIST
                    PsiElement(override)('override')
                  PsiWhiteSpace(' ')
                  PsiElement(fun)('fun')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('next')
                  VALUE_PARAMETER_LIST
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('T')
                  PsiWhiteSpace(' ')
                  BLOCK
                    PsiElement(LBRACE)('{')
                    PsiWhiteSpace('\n      ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        PREFIX_EXPRESSION
                          OPERATION_REFERENCE
                            PsiElement(EXCL)('!')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('hasNext')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace('\n        ')
                      THEN
                        THROW
                          PsiElement(throw)('throw')
                          PsiWhiteSpace(' ')
                          CALL_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('NoMoreElementsException')
                            VALUE_ARGUMENT_LIST
                              PsiElement(LPAR)('(')
                              PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n      ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('checkVersion')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n\n      ')
                    BINARY_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('lastNode')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQ)('=')
                      PsiWhiteSpace(' ')
                      CALL_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('nextNode')
                        VALUE_ARGUMENT_LIST
                          PsiElement(LPAR)('(')
                          PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n      ')
                    RETURN
                      PsiElement(return)('return')
                      PsiWhiteSpace(' ')
                      DOT_QUALIFIED_EXPRESSION
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('lastNode')
                        PsiElement(DOT)('.')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('value')
                    PsiWhiteSpace('\n    ')
                    PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n\n    ')
                FUN
                  MODIFIER_LIST
                    PsiElement(private)('private')
                  PsiWhiteSpace(' ')
                  PsiElement(fun)('fun')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('nextNode')
                  VALUE_PARAMETER_LIST
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('TreeNode')
                  PsiWhiteSpace(' ')
                  BLOCK
                    PsiElement(LBRACE)('{')
                    PsiWhiteSpace('\n      ')
                    WHILE
                      PsiElement(while)('while')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BOOLEAN_CONSTANT
                          PsiElement(true)('true')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace(' ')
                      BODY
                        BLOCK
                          PsiElement(LBRACE)('{')
                          PsiWhiteSpace('\n        ')
                          IF
                            PsiElement(if)('if')
                            PsiWhiteSpace(' ')
                            PsiElement(LPAR)('(')
                            CONDITION
                              PREFIX_EXPRESSION
                                OPERATION_REFERENCE
                                  PsiElement(EXCL)('!')
                                DOT_QUALIFIED_EXPRESSION
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('down')
                                  PsiElement(DOT)('.')
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('isEmpty')
                            PsiElement(RPAR)(')')
                            PsiWhiteSpace(' ')
                            THEN
                              BLOCK
                                PsiElement(LBRACE)('{')
                                PsiWhiteSpace('\n          ')
                                PROPERTY
                                  PsiElement(val)('val')
                                  PsiWhiteSpace(' ')
                                  PsiElement(IDENTIFIER)('curNode')
                                  PsiWhiteSpace(' ')
                                  PsiElement(EQ)('=')
                                  PsiWhiteSpace(' ')
                                  DOT_QUALIFIED_EXPRESSION
                                    REFERENCE_EXPRESSION
                                      PsiElement(IDENTIFIER)('down')
                                    PsiElement(DOT)('.')
                                    CALL_EXPRESSION
                                      REFERENCE_EXPRESSION
                                        PsiElement(IDENTIFIER)('pop')
                                      VALUE_ARGUMENT_LIST
                                        PsiElement(LPAR)('(')
                                        PsiElement(RPAR)(')')
                                PsiWhiteSpace('\n          ')
                                IF
                                  PsiElement(if)('if')
                                  PsiWhiteSpace(' ')
                                  PsiElement(LPAR)('(')
                                  CONDITION
                                    BINARY_EXPRESSION
                                      DOT_QUALIFIED_EXPRESSION
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('curNode')
                                        PsiElement(DOT)('.')
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('left')
                                      PsiWhiteSpace(' ')
                                      OPERATION_REFERENCE
                                        PsiElement(EXCLEQ)('!=')
                                      PsiWhiteSpace(' ')
                                      NULL
                                        PsiElement(null)('null')
                                  PsiElement(RPAR)(')')
                                  PsiWhiteSpace(' ')
                                  THEN
                                    BLOCK
                                      PsiElement(LBRACE)('{')
                                      PsiWhiteSpace('\n            ')
                                      DOT_QUALIFIED_EXPRESSION
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('up')
                                        PsiElement(DOT)('.')
                                        CALL_EXPRESSION
                                          REFERENCE_EXPRESSION
                                            PsiElement(IDENTIFIER)('push')
                                          VALUE_ARGUMENT_LIST
                                            PsiElement(LPAR)('(')
                                            VALUE_ARGUMENT
                                              REFERENCE_EXPRESSION
                                                PsiElement(IDENTIFIER)('curNode')
                                            PsiElement(RPAR)(')')
                                      PsiWhiteSpace('\n            ')
                                      DOT_QUALIFIED_EXPRESSION
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('down')
                                        PsiElement(DOT)('.')
                                        CALL_EXPRESSION
                                          REFERENCE_EXPRESSION
                                            PsiElement(IDENTIFIER)('push')
                                          VALUE_ARGUMENT_LIST
                                            PsiElement(LPAR)('(')
                                            VALUE_ARGUMENT
                                              DOT_QUALIFIED_EXPRESSION
                                                REFERENCE_EXPRESSION
                                                  PsiElement(IDENTIFIER)('curNode')
                                                PsiElement(DOT)('.')
                                                REFERENCE_EXPRESSION
                                                  PsiElement(IDENTIFIER)('left')
                                            PsiElement(RPAR)(')')
                                      PsiWhiteSpace('\n          ')
                                      PsiElement(RBRACE)('}')
                                  PsiWhiteSpace(' ')
                                  PsiElement(else)('else')
                                  PsiWhiteSpace(' ')
                                  ELSE
                                    BLOCK
                                      PsiElement(LBRACE)('{')
                                      PsiWhiteSpace('\n            ')
                                      IF
                                        PsiElement(if)('if')
                                        PsiWhiteSpace(' ')
                                        PsiElement(LPAR)('(')
                                        CONDITION
                                          BINARY_EXPRESSION
                                            DOT_QUALIFIED_EXPRESSION
                                              REFERENCE_EXPRESSION
                                                PsiElement(IDENTIFIER)('curNode')
                                              PsiElement(DOT)('.')
                                              REFERENCE_EXPRESSION
                                                PsiElement(IDENTIFIER)('right')
                                            PsiWhiteSpace(' ')
                                            OPERATION_REFERENCE
                                              PsiElement(EXCLEQ)('!=')
                                            PsiWhiteSpace(' ')
                                            NULL
                                              PsiElement(null)('null')
                                        PsiElement(RPAR)(')')
                                        PsiWhiteSpace(' ')
                                        THEN
                                          BLOCK
                                            PsiElement(LBRACE)('{')
                                            PsiWhiteSpace('\n              ')
                                            DOT_QUALIFIED_EXPRESSION
                                              REFERENCE_EXPRESSION
                                                PsiElement(IDENTIFIER)('down')
                                              PsiElement(DOT)('.')
                                              CALL_EXPRESSION
                                                REFERENCE_EXPRESSION
                                                  PsiElement(IDENTIFIER)('push')
                                                VALUE_ARGUMENT_LIST
                                                  PsiElement(LPAR)('(')
                                                  VALUE_ARGUMENT
                                                    DOT_QUALIFIED_EXPRESSION
                                                      REFERENCE_EXPRESSION
                                                        PsiElement(IDENTIFIER)('curNode')
                                                      PsiElement(DOT)('.')
                                                      REFERENCE_EXPRESSION
                                                        PsiElement(IDENTIFIER)('right')
                                                  PsiElement(RPAR)(')')
                                            PsiWhiteSpace('\n            ')
                                            PsiElement(RBRACE)('}')
                                      PsiWhiteSpace('\n            ')
                                      RETURN
                                        PsiElement(return)('return')
                                        PsiWhiteSpace(' ')
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('curNode')
                                      PsiElement(SEMICOLON)(';')
                                      PsiWhiteSpace('\n          ')
                                      PsiElement(RBRACE)('}')
                                PsiWhiteSpace('\n        ')
                                PsiElement(RBRACE)('}')
                            PsiWhiteSpace(' ')
                            PsiElement(else)('else')
                            PsiWhiteSpace(' ')
                            ELSE
                              BLOCK
                                PsiElement(LBRACE)('{')
                                PsiWhiteSpace('\n          ')
                                PROPERTY
                                  PsiElement(val)('val')
                                  PsiWhiteSpace(' ')
                                  PsiElement(IDENTIFIER)('curNode')
                                  PsiWhiteSpace(' ')
                                  PsiElement(EQ)('=')
                                  PsiWhiteSpace(' ')
                                  DOT_QUALIFIED_EXPRESSION
                                    REFERENCE_EXPRESSION
                                      PsiElement(IDENTIFIER)('up')
                                    PsiElement(DOT)('.')
                                    CALL_EXPRESSION
                                      REFERENCE_EXPRESSION
                                        PsiElement(IDENTIFIER)('pop')
                                      VALUE_ARGUMENT_LIST
                                        PsiElement(LPAR)('(')
                                        PsiElement(RPAR)(')')
                                PsiWhiteSpace('\n          ')
                                IF
                                  PsiElement(if)('if')
                                  PsiWhiteSpace(' ')
                                  PsiElement(LPAR)('(')
                                  CONDITION
                                    BINARY_EXPRESSION
                                      DOT_QUALIFIED_EXPRESSION
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('curNode')
                                        PsiElement(DOT)('.')
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('right')
                                      PsiWhiteSpace(' ')
                                      OPERATION_REFERENCE
                                        PsiElement(EXCLEQ)('!=')
                                      PsiWhiteSpace(' ')
                                      NULL
                                        PsiElement(null)('null')
                                  PsiElement(RPAR)(')')
                                  PsiWhiteSpace(' ')
                                  THEN
                                    BLOCK
                                      PsiElement(LBRACE)('{')
                                      PsiWhiteSpace('\n            ')
                                      DOT_QUALIFIED_EXPRESSION
                                        REFERENCE_EXPRESSION
                                          PsiElement(IDENTIFIER)('down')
                                        PsiElement(DOT)('.')
                                        CALL_EXPRESSION
                                          REFERENCE_EXPRESSION
                                            PsiElement(IDENTIFIER)('push')
                                          VALUE_ARGUMENT_LIST
                                            PsiElement(LPAR)('(')
                                            VALUE_ARGUMENT
                                              DOT_QUALIFIED_EXPRESSION
                                                REFERENCE_EXPRESSION
                                                  PsiElement(IDENTIFIER)('curNode')
                                                PsiElement(DOT)('.')
                                                REFERENCE_EXPRESSION
                                                  PsiElement(IDENTIFIER)('right')
                                            PsiElement(RPAR)(')')
                                      PsiWhiteSpace('\n          ')
                                      PsiElement(RBRACE)('}')
                                PsiWhiteSpace('\n          ')
                                RETURN
                                  PsiElement(return)('return')
                                  PsiWhiteSpace(' ')
                                  REFERENCE_EXPRESSION
                                    PsiElement(IDENTIFIER)('curNode')
                                PsiWhiteSpace('\n        ')
                                PsiElement(RBRACE)('}')
                          PsiWhiteSpace('\n      ')
                          PsiElement(RBRACE)('}')
                    PsiWhiteSpace('\n    ')
                    PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n\n    ')
                PROPERTY
                  MODIFIER_LIST
                    PsiElement(override)('override')
                  PsiWhiteSpace(' ')
                  PsiElement(val)('val')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('hasNext')
                  PsiWhiteSpace(' ')
                  PsiElement(COLON)(':')
                  PsiWhiteSpace(' ')
                  TYPE_REFERENCE
                    USER_TYPE
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('Boolean')
                  PsiWhiteSpace('\n      ')
                  PROPERTY_ACCESSOR
                    PsiElement(get)('get')
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                    PsiWhiteSpace(' ')
                    PsiElement(EQ)('=')
                    PsiWhiteSpace(' ')
                    BINARY_EXPRESSION
                      PREFIX_EXPRESSION
                        OPERATION_REFERENCE
                          PsiElement(EXCL)('!')
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('down')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('isEmpty')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(OROR)('||')
                      PsiWhiteSpace(' ')
                      PREFIX_EXPRESSION
                        OPERATION_REFERENCE
                          PsiElement(EXCL)('!')
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('up')
                          PsiElement(DOT)('.')
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('isEmpty')
                PsiWhiteSpace('\n\n\n    ')
                FUN
                  MODIFIER_LIST
                    PsiElement(override)('override')
                  PsiWhiteSpace(' ')
                  PsiElement(fun)('fun')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('remove')
                  VALUE_PARAMETER_LIST
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  BLOCK
                    PsiElement(LBRACE)('{')
                    PsiWhiteSpace('\n      ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('checkVersion')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n      ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('lastNode')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EQEQ)('==')
                          PsiWhiteSpace(' ')
                          NULL
                            PsiElement(null)('null')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace('\n        ')
                      THEN
                        THROW
                          PsiElement(throw)('throw')
                          PsiWhiteSpace(' ')
                          CALL_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('IterationException')
                            VALUE_ARGUMENT_LIST
                              PsiElement(LPAR)('(')
                              VALUE_ARGUMENT
                                STRING_TEMPLATE
                                  PsiElement(OPEN_QUOTE)('"')
                                  LITERAL_STRING_TEMPLATE_ENTRY
                                    PsiElement(REGULAR_STRING_PART)('Nothing to remove')
                                  PsiElement(CLOSING_QUOTE)('"')
                              PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n      ')
                    CALL_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('remove')
                      VALUE_ARGUMENT_LIST
                        PsiElement(LPAR)('(')
                        VALUE_ARGUMENT
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('lastNode')
                        PsiElement(RPAR)(')')
                    PsiWhiteSpace('\n      ')
                    POSTFIX_EXPRESSION
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('version')
                      OPERATION_REFERENCE
                        PsiElement(PLUSPLUS)('++')
                    PsiWhiteSpace('\n      ')
                    BINARY_EXPRESSION
                      DOT_QUALIFIED_EXPRESSION
                        DOT_QUALIFIED_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('BinaryTree')
                          PsiElement(DOT)('.')
                          THIS_EXPRESSION
                            REFERENCE_EXPRESSION
                              PsiElement(this)('this')
                        PsiElement(DOT)('.')
                        REFERENCE_EXPRESSION
                          PsiElement(IDENTIFIER)('version')
                      PsiWhiteSpace(' ')
                      OPERATION_REFERENCE
                        PsiElement(EQ)('=')
                      PsiWhiteSpace(' ')
                      REFERENCE_EXPRESSION
                        PsiElement(IDENTIFIER)('version')
                    PsiWhiteSpace('\n    ')
                    PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n\n    ')
                FUN
                  MODIFIER_LIST
                    PsiElement(private)('private')
                  PsiWhiteSpace(' ')
                  PsiElement(fun)('fun')
                  PsiWhiteSpace(' ')
                  PsiElement(IDENTIFIER)('checkVersion')
                  VALUE_PARAMETER_LIST
                    PsiElement(LPAR)('(')
                    PsiElement(RPAR)(')')
                  PsiWhiteSpace(' ')
                  BLOCK
                    PsiElement(LBRACE)('{')
                    PsiWhiteSpace('\n      ')
                    IF
                      PsiElement(if)('if')
                      PsiWhiteSpace(' ')
                      PsiElement(LPAR)('(')
                      CONDITION
                        BINARY_EXPRESSION
                          REFERENCE_EXPRESSION
                            PsiElement(IDENTIFIER)('version')
                          PsiWhiteSpace(' ')
                          OPERATION_REFERENCE
                            PsiElement(EXCLEQ)('!=')
                          PsiWhiteSpace(' ')
                          DOT_QUALIFIED_EXPRESSION
                            DOT_QUALIFIED_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('BinaryTree')
                              PsiElement(DOT)('.')
                              THIS_EXPRESSION
                                REFERENCE_EXPRESSION
                                  PsiElement(this)('this')
                            PsiElement(DOT)('.')
                            REFERENCE_EXPRESSION
                              PsiElement(IDENTIFIER)('version')
                      PsiElement(RPAR)(')')
                      PsiWhiteSpace(' ')
                      THEN
                        BLOCK
                          PsiElement(LBRACE)('{')
                          PsiWhiteSpace('\n        ')
                          THROW
                            PsiElement(throw)('throw')
                            PsiWhiteSpace(' ')
                            CALL_EXPRESSION
                              REFERENCE_EXPRESSION
                                PsiElement(IDENTIFIER)('ConcurrentModificationException')
                              VALUE_ARGUMENT_LIST
                                PsiElement(LPAR)('(')
                                PsiElement(RPAR)(')')
                          PsiWhiteSpace('\n      ')
                          PsiElement(RBRACE)('}')
                    PsiWhiteSpace('                                              \n    ')
                    PsiElement(RBRACE)('}')
                PsiWhiteSpace('\n  ')
                PsiElement(RBRACE)('}')
        PsiWhiteSpace('\n\n')
        PsiElement(RBRACE)('}')