TypeRepresentation:a.pythonTypeRepresentation
  PyFunctionTypeRepresentation
    PsiElement(Py:DEF_KEYWORD)('def')
    PsiWhiteSpace(' ')
    PyReferenceExpression: test
      PsiElement(Py:IDENTIFIER)('test')
      PsiElement(Py:DOT)('.')
      PsiElement(Py:IDENTIFIER)('f')
    PyParameterListRepresentation
      PsiElement(Py:LPAR)('(')
      PyNamedParameterTypeRepresentation('a')
        PsiElement(Py:IDENTIFIER)('a')
        PsiElement(Py:COLON)(':')
        PsiWhiteSpace(' ')
        PyReferenceExpression: int
          PsiElement(Py:IDENTIFIER)('int')
      PsiElement(Py:COMMA)(',')
      PsiWhiteSpace(' ')
      PySlashParameter
        PsiElement(Py:DIV)('/')
      PsiElement(Py:COMMA)(',')
      PsiWhiteSpace(' ')
      PyNamedParameterTypeRepresentation('b')
        PsiElement(Py:IDENTIFIER)('b')
        PsiElement(Py:COLON)(':')
        PsiWhiteSpace(' ')
        PyReferenceExpression: str
          PsiElement(Py:IDENTIFIER)('str')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyNoneLiteralExpression
      PsiElement(Py:NONE_KEYWORD)('None')