remove obsolete givens from regionck#107376
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aliemjay
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Jan 27, 2023
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is this still blocked on #105982 now? |
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Nope. |
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lcnr
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can you still make this an exhaustive match on r_a?
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cna we always use opportunistic_resolve_region here?
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☔ The latest upstream changes (presumably #108096) made this pull request unmergeable. Please resolve the merge conflicts. |
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always resolve to universal regions if possible `RegionConstraintCollector::opportunistic_resolve_var`, which is used in canonicalization and projection logic, doesn't resolve the region var to an equal universal region. So if we have equated `'static == '1 == '2`, it doesn't resolve `'1` or `'2` to `'static`. Now it does! Addresses review comment rust-lang#107376 (comment). r? `@lcnr`
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (e84e5ff): comparison URL. Overall result: ❌✅ regressions and improvements - ACTION NEEDEDNext Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression Warning ⚠: The following benchmark(s) failed to build:
cc @rust-lang/wg-compiler-performance Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
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| ty: Ty<'tcx>, | ||
| ) -> Vec<OutlivesBound<'tcx>> { | ||
| let ty = self.resolve_vars_if_possible(ty); | ||
| let ty = OpportunisticRegionResolver::new(self).fold_ty(ty); |
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is it still needed to fold twice here?
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This PR broke compilation of |
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@aliemjay can you look into that breakage and whether that's something we can quickly fix? otherwise we should probably revert this 🤔 |
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I've prepared a draft revert just in case in #109183, and the pub trait MapAccess {
type Error;
fn next_key_seed(&mut self) -> Option<Self::Error>;
}
struct Access<'a> {
_marker: std::marker::PhantomData<&'a ()>,
}
impl<'a, 'b: 'a> MapAccess for Access<'a> {
type Error = ();
fn next_key_seed(&mut self) -> Option<Self::Error> {
unimplemented!()
}
}Feel free to close the revert PR if we can land the fix soon. It may be a simple fix since the update: the revert is now in the bors queue. |
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Revert rust-lang#107376 to fix potential `bincode` breakage and `rustc-perf` benchmark. rust-lang#107376 caused `rustc-perf`'s `webrender` benchmark to break, by regressing on the `bincode-1.3.3` crate. ~~This PR is a draft revert in case we can't land a fix soon enough, and we'd like to land the revert instead~~ (Though I myself think it'd be safer to do the revert, and run crater when relanding rust-lang#107376.) cc `@aliemjay`
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Revert rust-lang#107376 to fix potential `bincode` breakage and `rustc-perf` benchmark. rust-lang#107376 caused `rustc-perf`'s `webrender` benchmark to break, by regressing on the `bincode-1.3.3` crate. ~~This PR is a draft revert in case we can't land a fix soon enough, and we'd like to land the revert instead~~ (Though I myself think it'd be safer to do the revert, and run crater when relanding rust-lang#107376.) cc `@aliemjay`
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@rustbot label: +perf-regression-triaged |
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Mar 28, 2023
remove obsolete `givens` from regionck Revives rust-lang#107376. The only change is the last commit (rust-lang@2a3177a) which should fix the regression. Fixes rust-lang#106567 r? `@lcnr`
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Feb 3, 2026
always resolve to universal regions if possible `RegionConstraintCollector::opportunistic_resolve_var`, which is used in canonicalization and projection logic, doesn't resolve the region var to an equal universal region. So if we have equated `'static == '1 == '2`, it doesn't resolve `'1` or `'2` to `'static`. Now it does! Addresses review comment rust-lang/rust#107376 (comment). r? `@lcnr`
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Fixes #106567
r? @lcnr (feel free to reassign)