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WG-trait-system-refactor

The Rustc Trait System Refactor Initiative (-Znext-solver)

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Jul 29, 2026

rust-bors Bot pushed a commit that referenced this pull request

Jul 29, 2026

Check for the empty case in `collect_remaining_errors()`

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rust-bors Bot pushed a commit that referenced this pull request

Jul 29, 2026

Check for the empty case in `collect_remaining_errors()`

As it's very common.

This has multiple advantages:
 - Performance. The new type is 1/3 the size of `Vec` (being equivalent in layout to `Option<ThinVec>`) and can be kept in a register.
 - Type safety. We mark the type `#[must_use]`, and thinks requiring errors take `ThinVec`, which requires unwrapping the type and verifying there is indeed an error. We still provide conversions to slices, `ThinVec`, and iteration, because some code needs this and I saw no benefit in changing it, but we deliberately do not provide `Deref<Target = [E]>` or things like that.

lcnr mentioned this pull request

Aug 6, 2026

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Aug 6, 2026

This was referenced

Aug 7, 2026

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