Rework support for async closures; allow them to return futures that borrow from the closure's captures#120361

Merged

bors merged 12 commits intorust-lang:masterfrom

compiler-errors:async-closures

Feb 6, 2024

Commits on Feb 6, 2024

Make sure that async closures (and fns) only capture their parent callable's parameters by move, and nothing else
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Make async closures directly lower to ClosureKind::CoroutineClosure
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Add CoroutineClosure to TyKind, AggregateKind, UpvarArgs
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Teach typeck/borrowck/solvers how to deal with async closures
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Build a shim to call async closures with different AsyncFn trait kinds
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Construct body for by-move coroutine closure output
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Bless tests, add comments
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Add some tests
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More comments, final tweaks
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Fix drop shim for AsyncFnOnce closure, AsyncFnMut shim for AsyncFn closure
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Document `async_fn_traits`

oli-obk
authored and
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Fudge coroutine argument for CoroutineKindShim in fn_sig_for_fn_abi
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