FunctionTypeComment:a.functionTypeComment
  PyFunctionTypeAnnotation
    PyParameterTypeList
      PsiElement(Py:LPAR)('(')
      PsiErrorElement:')' expected
        <empty list>
  PsiErrorElement:Unexpected tokens
    PsiElement(Py:DEF_KEYWORD)('def')
    PsiWhiteSpace(' ')
    PsiElement(Py:IDENTIFIER)('foo')
    PsiElement(Py:RPAR)(')')