[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


----------
stage: patch review -> backport needed

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46581>
_______________________________________