Rewrite lifetimes lint pass
#14715
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Rewrite lifetimes lint pass
#14715
+1,454
−1,118
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* Change lint message to not mention the lifetime names * Only point to the lifetime definition in the lint span.
…done when no lint is produced, but has a few behavior changes. * Input to output inference on `dyn Trait` lifetimes is handled with a sufficient MSRV. * Elision on `dyn Trait` input lifetimes where the lifetime is used only once is suggested on all versions. * Lifetimes that are only used as a constraint on a single type are no longer detected. This is a regression. * A bunch of cases where the lints where prevented, but only a single lifetime was non-elidible now lint on remaining lifetimes.
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☔ The latest upstream changes (possibly 03a5b6b) made this pull request unmergeable. Please resolve the merge conflicts. |
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r? clippy |
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The dogfood error hints at a missing semicolon. Should be easy to fix. |
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This will take more time to review than I have right now, but I have a 9 hour flight tomorrow, so I could pull that branch before departure... |
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In any event, add a semicolon to |
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Based on #14702
This should generally be a perf improvement. The old implementation allocated a lot of things and then did multiple passes over the data. This only does a single pass allocating significantly less. It also bails out earlier in most cases.
Some behaviour changes:
dyn Trait + 'ais now elided when possible instead of completely bailing out of the lint.<'a, T: 'a>where'ais only used for the type outlives constraint. Theses lifetimes can be removed, but I'd rather handle that at the same time as handling outlives constraints on lifetimes.changelog: [
elidable_lifetime_names]: Lint whendyn Trait + 'acan be elided.changelog: [
needless_lifetimes] [elidable_lifetime_names]: Lint more cases when only some lifetimes can be elided.