Rollup merge of #139341 - nnethercote:fix-137874, r=petrochenkov

Apply `Recovery::Forbidden` when reparsing pasted macro fragments.

Fixes #137874.

The changes to the output of `tests/ui/associated-consts/issue-93835.rs`
partly undo the changes seen when `NtTy` was removed in #133436, which
is good.

r? ``@petrochenkov``

Author: Zalathar