Normalize associated type projections when checking return type of main #88706
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r? @nagisa (rust-highfive has picked a reviewer for you, use r? to override) |
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This is my first time actually touching anything within typechecking, so please let me know if I accidentally silently broke something or did something wrong. 😅 |
This fixes rust-lang#88609. Previously, the return type of `fn main()` would not have any associated type projections within normalized before checking if it implements the standard library trait `std::process::Termination`. This commit appears to fix it. This feels vaguely symptomatic of a problem in the underlying trait solving engine, but I am not sure how I would solve that. I am unsure why the example in rust-lang#88609 with `assert_impl_termination` and `fn foo()` work, but simply `fn main()` doesn't. The way that I solved this is also probably not the best way to do this, so please let me know if there is a better way to do this. I have added a build-pass regression test for this issue.
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r? @jackh726 |
Use register_predicate_obligations rather than a for loop, since I didn't see that before. Also destructure in the `let` rather than projecting the fields individually
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@bors r+ rollup |
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📌 Commit 33a2825 has been approved by |
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…arth Rollup of 10 pull requests Successful merges: - rust-lang#88706 (Normalize associated type projections when checking return type of main) - rust-lang#88828 (Use `libc::sigaction()` instead of `sys::signal()` to prevent a deadlock) - rust-lang#88871 (Fix suggestion for nested struct patterns) - rust-lang#89317 (Move generic error message to separate branches) - rust-lang#89351 (for signed wrapping remainder, do not compare lhs with MIN) - rust-lang#89442 (Add check for duplicated doc aliases) - rust-lang#89502 (Fix Lower/UpperExp formatting for integers and precision zero) - rust-lang#89523 (Make `proc_macro_derive_resolution_fallback` a future-breakage lint) - rust-lang#89532 (Document behavior of `MaybeLiveLocals` regarding enums and field-senstivity) - rust-lang#89546 (Make an initial guess for metadata size to reduce buffer resizes) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This fixes #88609.
Previously, the return type of
fn main()would not have any associated type projections within normalized before checking if it implements the standard library traitstd::process::Termination. This commit appears to fix it.This feels vaguely symptomatic of a problem in the underlying trait solving engine, but I am not sure how I would solve that. I am unsure why the example in #88609 with
assert_impl_terminationandfn foo()work, but simplyfn main()doesn't. The way that I solved this is also probably not the best way to do this, so please let me know if there is a better way to do this.I have added a build-pass regression test for this issue.