Deduplicate ParamCandidates with the same value except for bound vars#84559
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bors merged 2 commits intorust-lang:masterfrom May 6, 2021
Merged
Deduplicate ParamCandidates with the same value except for bound vars#84559bors merged 2 commits intorust-lang:masterfrom
bors merged 2 commits intorust-lang:masterfrom
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nikomatsakis
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Apr 30, 2021
| // the same except for unused bound vars. Just pick the current one (the should | ||
| // both evaluate to the same answer). This is probably best characterized as a | ||
| // "hack", since we might prefer to just do our best to *not* create essentially | ||
| // duplicate candidates in the first place. |
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maybe we want to pick the one with fewer bound vars? it'd be nice to be more deterministic here
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This fixes a regression that slipped into beta 1.53, nominating for backport. |
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Status on this: discussed with @nikomatsakis a change he'd like to see here. Just have to get some time to implement it. |
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@bors r+ |
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📌 Commit c1ef0f3 has been approved by |
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@bors rollup=never p=1 we want this into master and backported soon, but I also want perf individually on it (no need to prerun) |
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☀️ Test successful - checks-actions |
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May 7, 2021
…ulacrum [beta] backports First-ish round of beta backports: * [beta] backport for rust-lang#84769 rust-lang#84969 * [beta] Bump stage0 to production 1.52.0 rust-lang#84994 * Deduplicate ParamCandidates with the same value except for bound vars rust-lang#84559
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Fixes #84398
This is kind of a hack. I wonder if we can get other types of candidates that are the same except for bound vars. This won't be a problem with Chalk, since we don't really need to know that there are two different "candidates" if they both give the same final substitution.
r? @nikomatsakis