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)('(')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyFunctionTypeRepresentation
      PyParameterListRepresentation
        PsiElement(Py:LPAR)('(')
        PyReferenceExpression: int
          PsiElement(Py:IDENTIFIER)('int')
        PsiElement(Py:RPAR)(')')
      PsiWhiteSpace(' ')
      PsiElement(Py:RARROW)('->')
      PsiWhiteSpace(' ')
      PyReferenceExpression: str
        PsiElement(Py:IDENTIFIER)('str')