> I believe we can close this now, Victor. Please reopen if you disagree :)

I validated that all tests named "test(...)disallow(...)inst(...)" are now using support.check_disallow_instantiation().

Lib/test/test_tcl.py might use it in:

    @support.cpython_only
    def test_new_tcl_obj(self):
        self.assertRaises(TypeError, _tkinter.Tcl_Obj)
        self.assertRaises(TypeError, _tkinter.TkttType)
        self.assertRaises(TypeError, _tkinter.TkappType)

Serhiy suggested to write an unit test for curses.ncurses_version:
https://bugs.python.org/issue43916#msg391936

This work can be done in bpo-43916.