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Async drop fix for dropee from another crate (#140858) Fixes https://github.com/rust-lang/rust/issues/140858. For `AsyncDestructor` impl def id was wrongly kept as a LocalDefId, which causes crash when dropee is declared in another crate. Also, potential problem found: when user crate drops type with async drop in dependency crate, and user crate doesn't enable `feature(async_drop)`, then sync drop version will be used. Is it a problem? Do we need some notification about such situations?
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