TypeRepresentation:a.pythonTypeRepresentation
  PyFunctionTypeRepresentation
    PsiElement(Py:DEF_KEYWORD)('def')
    PsiWhiteSpace(' ')
    PyReferenceExpression: test
      PsiElement(Py:IDENTIFIER)('test')
      PsiElement(Py:DOT)('.')
      PsiElement(Py:IDENTIFIER)('A')
      PsiElement(Py:DOT)('.')
      PsiElement(Py:IDENTIFIER)('B')
      PsiElement(Py:DOT)('.')
      PsiElement(Py:IDENTIFIER)('f')
    PyParameterListRepresentation
      PsiElement(Py:LPAR)('(')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyNoneLiteralExpression
      PsiElement(Py:NONE_KEYWORD)('None')