TypeRepresentation:a.pythonTypeRepresentation
  PyParenthesizedExpression
    PsiElement(Py:LPAR)('(')
    PsiErrorElement:')' expected
      <empty list>
  PsiErrorElement:Unexpected token
    <empty list>
  PsiElement(Py:DEF_KEYWORD)('def')
  PsiWhiteSpace(' ')
  PyReferenceExpression: foo
    PsiElement(Py:IDENTIFIER)('foo')
  PsiErrorElement:Unexpected token
    <empty list>
  PsiElement(Py:RPAR)(')')