Use impl_header_lifetime_elision in libcore #54687
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r? @dtolnay (rust_highfive has picked a reviewer for you, use r? to override) |
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Sep 30, 2018
| @@ -14,7 +14,7 @@ LL | impl Copy for &'static NotSync {} | |||
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |||
| | | |||
| = note: conflicting implementation in crate `core`: | |||
| - impl<'a, T> std::marker::Copy for &'a T | |||
| - impl<'_, T> std::marker::Copy for &T | |||
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This line is not valid syntax. I filed #54690 to follow up.
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@bors r+ |
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📌 Commit 8d6bee3 has been approved by |
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@dtolnay I needed to add a commit to fix the libcore test build; please re-r+ |
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Looks good! @bors r+ |
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📌 Commit d4840da has been approved by |
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⌛ Testing commit d4840da with merge 5ed5b3bcb5610cf0712466f4887142bb62c4ebbd... |
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💔 Test failed - status-appveyor |
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3hr timeout on appveyor: https://ci.appveyor.com/project/rust-lang/rust/build/1.0.9185 Can I get a retry, please? |
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@bors retry |
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Use impl_header_lifetime_elision in libcore The feature is approved for stabilization, so let's use it to remove about 300 `'a`s. Tracking issue for the feature: rust-lang#15872
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Use impl_header_lifetime_elision in libcore The feature is approved for stabilization, so let's use it to remove about 300 `'a`s. Tracking issue for the feature: rust-lang#15872
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Rollup of 10 pull requests Successful merges: - #54269 (#53840: Consolidate pattern check errors) - #54458 (Allow both explicit and elided lifetimes in the same impl header) - #54603 (Add `crate::` to trait suggestions in Rust 2018.) - #54648 (Update Cargo's submodule) - #54680 (make run-pass tests with empty main just compile-pass tests) - #54687 (Use impl_header_lifetime_elision in libcore) - #54699 (Re-export `getopts` so custom drivers can reference it.) - #54702 (do not promote comparing function pointers) - #54728 (Renumber `proc_macro` tracking issues) - #54745 (make `CStr::from_bytes_with_nul_unchecked()` a const fn) Failed merges: r? @ghost
This was referenced Oct 3, 2018
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Stabilize impl_header_lifetime_elision in 2015 ~~This is currently blocked on #54902; it should be good after that~~ It's already stable in 2018; this finishes the stabilization. FCP completed (#15872 (comment)), proposal (#15872 (comment)). Tracking issue: #15872 Usage examples (from libcore): #54687
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Use more impl header lifetime elision Inspired by seeing explicit lifetimes on these two: - https://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#impl-FusedIterator - https://doc.rust-lang.org/nightly/std/primitive.u32.html#impl-Not And a follow-up to rust-lang#54687, that started using IHLE in libcore. Most of the changes in here fall into two big categories: - Removing lifetimes from common traits that can essentially never user a lifetime from an input (particularly `Drop`, `Debug`, and `Clone`) - Forwarding impls that are only possible because the lifetime doesn't matter (like `impl<R: Read + ?Sized> Read for &mut R`) I omitted things that seemed like they could be more controversial, like the handful of iterators that have a `Item: 'static` despite the iterator having a lifetime or the `PartialEq` implementations [where the flipped one cannot elide the lifetime](https://internals.rust-lang.org/t/impl-type-parameter-aliases/9403/2?u=scottmcm). I also removed two lifetimes that turned out to be completely unused; see rust-lang#41960 (comment)
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Use more impl header lifetime elision Inspired by seeing explicit lifetimes on these two: - https://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#impl-FusedIterator - https://doc.rust-lang.org/nightly/std/primitive.u32.html#impl-Not And a follow-up to rust-lang/rust#54687, that started using IHLE in libcore. Most of the changes in here fall into two big categories: - Removing lifetimes from common traits that can essentially never user a lifetime from an input (particularly `Drop`, `Debug`, and `Clone`) - Forwarding impls that are only possible because the lifetime doesn't matter (like `impl<R: Read + ?Sized> Read for &mut R`) I omitted things that seemed like they could be more controversial, like the handful of iterators that have a `Item: 'static` despite the iterator having a lifetime or the `PartialEq` implementations [where the flipped one cannot elide the lifetime](https://internals.rust-lang.org/t/impl-type-parameter-aliases/9403/2?u=scottmcm). I also removed two lifetimes that turned out to be completely unused; see rust-lang/rust#41960 (comment)
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The feature is approved for stabilization, so let's use it to remove about 300
'as.Tracking issue for the feature: #15872