Implement `#[rustc_must_implement_one_of]` attribute#92164

Merged

bors merged 9 commits intorust-lang:masterfrom

WaffleLapkin:rustc_must_implement_one_of_attr

Jan 18, 2022

Commits on Jan 10, 2022

Fix `#[rustc_must_implement_one_of]`
WaffleLapkin
committed

Commits on Jan 11, 2022

Add a test for ungated `#[rustc_must_implement_one_of]`
WaffleLapkin
committed

Commits on Jan 14, 2022

Check for duplicate arguments in `#[rustc_must_implement_one_of]`
WaffleLapkin
committed
Do not use `HashSet` for `#[rustc_must_implement_one_of]`
WaffleLapkin
committed
Use `Symbol` for dup check in `#[rustc_must_implement_one_of]`
WaffleLapkin
committed