fix: Lower async block/closures correctly#20895
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Instead of `TyKind::Closure`. Note: the same `InternedCoroutineId` is used both for the *async closure* as well as for the *async block it returns*. When used in `TyKind::CoroutineClosure`, it represents the closure. When used in `TyKind::Coroutine`, it represents the async block. The generic args are different, though. Also noteworthy is that we distinguish between the different kinds of coroutines (general coroutines, async coroutines and eventually gen coroutines too) via the expression producing them (stored in the `InternedCoroutineId`). It might be worth it to introduce a `CoroutineKind` field to `InternedCoroutineId`, although this is not done in this PR.
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changelog fixup #20329 |
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…o-opaque fix: Lower async block/closures correctly
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TyKind::Coroutine/TyKind::CoroutineClosure, versus an opaque/normal closure.Can be reviewed commit-by-commit. The commit messages are also important.