Resolve function lifetime elision on the AST #97313
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Blocked on #96296. |
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@bors try @rust-timer queue |
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Awaiting bors try build completion. @rustbot label: +S-waiting-on-perf |
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⌛ Trying commit 5d4053639c6a30859f6001324667a3ec32e32f33 with merge a5ac7517e73160a094c58d00ac8f79b4935456d5... |
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This was referenced Jul 25, 2022
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Finished benchmarking commit (6dbae3a): comparison url. Instruction count
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Jul 26, 2022
Our nightly CI job [found](https://github.com/Enselic/cargo-public-api/actions/runs/2736941493) detected an upstream change which I think is caused by rust-lang/rust#97313. I tried to git bisect it but it didn't want to cooperate, so I have up. In either case, the change looks reasonable, so let's just adopt it.
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Jul 27, 2022
…r=petrochenkov Clean up HIR-based lifetime resolution Based on rust-lang#97313. Fixes rust-lang#98932. r? `@petrochenkov`
flip1995
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Jul 28, 2022
…enkov Clean up HIR-based lifetime resolution Based on rust-lang/rust#97313. Fixes #98932. r? `@petrochenkov`
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…henkov Resolve function lifetime elision on the AST ~Based on rust-lang#97720 Lifetime elision for functions is purely syntactic in nature, so can be resolved on the AST. This PR replicates the elision logic and diagnostics on the AST, and replaces HIR-based resolution by a `delay_span_bug`. This refactor allows for more consistent diagnostics, which don't have to guess the original code from HIR. r? `@petrochenkov`
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Aug 11, 2023
Fix elided lifetime in associated const
Fix an unelided lifetime in an associated const.
The old code was equivalent to:
```rust
impl<'a> RegistryConfig {
/// File name of [`RegistryConfig`].
const NAME: &'a str = "config.json";
}
```
and not `&'static str`, as it might be in a regular `const` item.
This "regressed" in rust-lang/rust#97313, which started allowing this behavior (inadvertently, as far as I can tell). It's not necessarily clear to me that this is sound (or at least, it's not something we intended to be able to express), but it's also preventing me from doing crater runs to investigate fallout of this issue (rust-lang/rust#114713 and rust-lang/rust#114716).
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…oc-ct-lt, r=cjgillot Warn on elided lifetimes in associated constants (`ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT`) Elided lifetimes in associated constants (in impls) erroneously resolve to fresh lifetime parameters on the impl since rust-lang#97313. This is not correct behavior (see rust-lang#38831). I originally opened rust-lang#114716 to fix this, but given the time that has passed, the crater results seem pretty bad: rust-lang#114716 (comment) This PR alternatively implements a lint against this behavior, and I'm hoping to bump this to deny in a few versions.
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…oc-ct-lt, r=cjgillot Warn on elided lifetimes in associated constants (`ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT`) Elided lifetimes in associated constants (in impls) erroneously resolve to fresh lifetime parameters on the impl since rust-lang#97313. This is not correct behavior (see rust-lang#38831). I originally opened rust-lang#114716 to fix this, but given the time that has passed, the crater results seem pretty bad: rust-lang#114716 (comment) This PR alternatively implements a lint against this behavior, and I'm hoping to bump this to deny in a few versions.
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…oc-ct-lt, r=cjgillot Warn on elided lifetimes in associated constants (`ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT`) Elided lifetimes in associated constants (in impls) erroneously resolve to fresh lifetime parameters on the impl since rust-lang#97313. This is not correct behavior (see rust-lang#38831). I originally opened rust-lang#114716 to fix this, but given the time that has passed, the crater results seem pretty bad: rust-lang#114716 (comment) This PR alternatively implements a lint against this behavior, and I'm hoping to bump this to deny in a few versions.
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Based on #97720Lifetime elision for functions is purely syntactic in nature, so can be resolved on the AST.
This PR replicates the elision logic and diagnostics on the AST, and replaces HIR-based resolution by a
delay_span_bug.This refactor allows for more consistent diagnostics, which don't have to guess the original code from HIR.
r? @petrochenkov