improve `#[may_dangle]` for type parameters#3417

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lcnr wants to merge 6 commits intorust-lang:masterfrom lcnr:bb-may-dangle

+250

Commits on Apr 17, 2023

replace may dangle with 2 attributes
lcnr
committed

Commits on Apr 18, 2023

Commits on Apr 20, 2023

update motivation, auto traits + variance concerns
lcnr
committed