[beta] Clippy: backport optimization and ICE fixes#110273

Merged

bors merged 2 commits intorust-lang:betafrom

flip1995:beta-backport

Apr 13, 2023

Commits on Apr 13, 2023

Cache `has_sig_drop_attr` for `significant_drop_tightening`

Noratrieb
authored and
flip1995
committed
Handle ambiguous projections

smoelius
authored and
flip1995
committed