gh-93345: Fix a crash in substitution of nested TypeVar after TypeVarTuple (GH-93346)

For example: tuple[*Ts, list[T]][int, str, bool]
(cherry picked from commit f545fc955aeb701ae4e73b07ff2283f823d857b8)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Miss Islington (bot) committed 4y ago

3265ff9ccc870a25dd970a05a778a91cf86ee00a

Parent: 00f8fe9

Committed by GitHub <noreply@github.com> on 6/1/2022, 6:43:38 AM