Remove needless dedup from projection #48315
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This reverts commit c6772b4.
rust-highfive
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Fix exponential projection complexity on nested types This implements solution 1 from #38528 (comment). The code quality is currently extremely poor, but we can improve them during review. Blocking issues: - we probably don't want a quadratic deduplication for obligations. - is there an alternative to deduplication? Based on #48315. Needs changelog. Noticable improvement on compile time is expected. Fix #38528 Close #39684 Close #43757
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Can we just roll this in #48296? Doesn't seem worth doing in a separate PR to me. |
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Sure, closing this. |
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…sakis Fix exponential projection complexity on nested types This implements solution 1 from rust-lang#38528 (comment). The code quality is currently extremely poor, but we can improve them during review. Blocking issues: - we probably don't want a quadratic deduplication for obligations. - is there an alternative to deduplication? Based on rust-lang#48315. Needs changelog. Noticable improvement on compile time is expected. Fix rust-lang#38528 Close rust-lang#39684 Close rust-lang#43757
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I have tried inserting an assertion and it didn't trigger for stage1 rustc build. The deduplication was implemented 3 years ago, and it's likely now we actually deduplicate already when assembling candidates.
Have a crater run if not confident.
Unused derives from #47656 are removed.
r? @nikomatsakis