TypeRepresentation:a.pythonTypeRepresentation
  PyFunctionTypeRepresentation
    PyParameterListRepresentation
      PsiElement(Py:LPAR)('(')
      PyElement
        PsiElement(Py:AT)('@')
        PsiElement(Py:IDENTIFIER)('Todo')
        PsiElement(Py:LPAR)('(')
        PsiElement(Py:TICK)('`')
        PsiElement(Py:IDENTIFIER)('Unpack')
        PsiElement(Py:LBRACKET)('[')
        PsiElement(Py:RBRACKET)(']')
        PsiElement(Py:TICK)('`')
        PsiWhiteSpace(' ')
        PsiElement(Py:IDENTIFIER)('special')
        PsiWhiteSpace(' ')
        PsiElement(Py:IDENTIFIER)('form')
        PsiElement(Py:RPAR)(')')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyNoneLiteralExpression
      PsiElement(Py:NONE_KEYWORD)('None')