KtFile: MissingCommaInValueArgumentList.kt
  PACKAGE_DIRECTIVE
    <empty list>
  IMPORT_LIST
    <empty list>
  PROPERTY
    PsiElement(val)('val')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('x')
    PsiWhiteSpace(' ')
    PsiElement(EQ)('=')
    PsiWhiteSpace(' ')
    CALL_EXPRESSION
      REFERENCE_EXPRESSION
        PsiElement(IDENTIFIER)('foo')
      VALUE_ARGUMENT_LIST
        PsiElement(LPAR)('(')
        PsiWhiteSpace('\n    ')
        VALUE_ARGUMENT
          REFERENCE_EXPRESSION
            PsiElement(IDENTIFIER)('a')
        PsiElement(COMMA)(',')
        PsiWhiteSpace('\n    ')
        VALUE_ARGUMENT
          BINARY_EXPRESSION
            REFERENCE_EXPRESSION
              PsiElement(IDENTIFIER)('b')
            PsiWhiteSpace('\n    ')
            OPERATION_REFERENCE
              PsiElement(IDENTIFIER)('c')
            PsiErrorElement:Expecting an element
              <empty list>
        PsiWhiteSpace('\n')
        PsiElement(RPAR)(')')