Fix async Fn confirmation for FnDef/FnPtr/Closure types
#121654
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
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oof. and the mixup is only really noticeable for projections, not just proving that one of the async fn traits holds |
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💀 |
oli-obk
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Feb 26, 2024
| let future_trait_def_id = tcx.require_lang_item(LangItem::Future, None); | ||
| let placeholder_output_ty = self.infcx.enter_forall_and_leak_universe(sig.output()); |
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so, if actually used (via unboxed closures), we'd just get odd errors about traits not being implemented even though they are?
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No, this change only affects async Fn trait goals, and makes them go from ICE -> PASS.
That issue I linked via unboxed closures still ICEs; I'll put up a fix like #108834 in a separate PR.
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I guess the tests implicitly test that r=me either way, and sorry for not catching these in review. |
No, it's definitely 100% my fault for writing extremely incomprehensible code lol |
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…llaumeGomez Rollup of 10 pull requests Successful merges: - rust-lang#118217 (Document which methods on `f64` are precise) - rust-lang#119748 (Increase visibility of `join_path` and `split_paths`) - rust-lang#121412 (platform docs: clarify hexagon-unknown-none-elf example, add hexagon-unknown-linux-musl) - rust-lang#121654 (Fix `async Fn` confirmation for `FnDef`/`FnPtr`/`Closure` types) - rust-lang#121700 (CFI: Don't compress user-defined builtin types) - rust-lang#121765 (add platform-specific function to get the error number for HermitOS) - rust-lang#121781 (bootstrap/format: send larger batches to rustfmt) - rust-lang#121788 (bootstrap: fix clap deprecated warnings) - rust-lang#121792 (Improve renaming suggestion when item starts with underscore) - rust-lang#121793 (Document which methods on `f32` are precise) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#121654 - compiler-errors:async-fn-for-fn-def, r=oli-obk Fix `async Fn` confirmation for `FnDef`/`FnPtr`/`Closure` types Fixes three issues: 1. The code in `extract_tupled_inputs_and_output_from_async_callable` was accidentally getting the *future* type and the *output* type (returned by the future) messed up for fnptr/fndef/closure types. :/ 2. We have a (class of) bug(s) in the old solver where we don't really support higher ranked built-in `Future` goals for generators. This is not possible to hit on stable code, but [can be hit with `unboxed_closures`](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=e935de7181e37e13515ad01720bcb899) (rust-lang#121653). * I'm opting not to fix that in this PR. Instead, I just instantiate placeholders when confirming `async Fn` goals. 4. Fixed a bug when generating `FnPtr` shims for `async Fn` trait goals. r? oli-obk
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Fixes three issues:
extract_tupled_inputs_and_output_from_async_callablewas accidentally getting the future type and the output type (returned by the future) messed up for fnptr/fndef/closure types. :/Futuregoals for generators. This is not possible to hit on stable code, but can be hit withunboxed_closures(Confirming built-in higher-ranked Future (and other coroutine) goals ICEs #121653).async Fngoals.FnPtrshims forasync Fntrait goals.r? oli-obk