JsonPathFile
  JsonPathFunctionCallImpl(FUNCTION_CALL)
    JsonPathIdImpl(ID)
      PsiElement(IDENTIFIER)('concat')
    PsiElement(()('(')
    JsonPathFunctionArgsListImpl(FUNCTION_ARGS_LIST)
      JsonPathStringLiteralImpl(STRING_LITERAL)
        PsiElement(DOUBLE_QUOTED_STRING)('"/"')
      PsiElement(,)(',')
      PsiWhiteSpace(' ')
      JsonPathPathExpressionImpl(PATH_EXPRESSION)
        JsonPathRootSegmentImpl(ROOT_SEGMENT)
          PsiElement($)('$')
        PsiElement(.)('.')
        JsonPathIdSegmentImpl(ID_SEGMENT)
          JsonPathIdImpl(ID)
            PsiElement(IDENTIFIER)('key')
    PsiElement())(')')