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| author | bors <bors@rust-lang.org> | 2019-11-12 04:44:30 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2019-11-12 04:44:30 +0000 |
| commit | e3d998492abd7d61aba12cfa058fce28c998a3ff (patch) | |
| tree | 2df921d0afe9c64362a52fa52bf5391f2298e706 /src/libstd/sys/unix/stack_overflow.rs | |
| parent | e931f00f658b59481925deb0152503038ca69b9e (diff) | |
| parent | fd9921b41c4354aaf790c2bc0393f818034100d0 (diff) | |
| download | rust-e3d998492abd7d61aba12cfa058fce28c998a3ff.tar.gz rust-e3d998492abd7d61aba12cfa058fce28c998a3ff.zip | |
Auto merge of #66129 - Nadrieril:refactor-slice-pat-usefulness, r=varkor
Refactor slice pattern usefulness checking As a follow up to https://github.com/rust-lang/rust/pull/65874, this PR changes how variable-length slice patterns are handled in usefulness checking. The objectives are: cleaning up that code to make it easier to understand, and paving the way to handling fixed-length slices more cleverly too, for https://github.com/rust-lang/rust/issues/53820. Before this, variable-length slice patterns were eagerly expanded into a union of fixed-length slices. Now they have their own special constructor, which allows expanding them a bit more lazily. As a nice side-effect, this improves diagnostics. This PR shows a slight performance improvement, mostly due to https://github.com/rust-lang/rust/pull/66129/commits/149792b6080f40875c0072aae378a0eb31d23df0. This will probably have to be reverted in some way when we implement or-patterns.
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