ty::Unevaluated: dealing with unused substs
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jyn514
reviewed
Aug 19, 2021
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It's a bit stronger than "full lazy norm", in that you can't look at the generic args of constants at all, but also quite a bit simpler, as it doesn't really interact with our type system. The biggest reason this is easier is that the affected parts of const generics are still unstable, so we don't have to worry about causing some subtle breakage. @matthewjasper did try to implement lazy norm and afaict found some annoying regressions: https://gist.github.com/matthewjasper/358245b033a1b7bd158acfe0c08d0d09 |
lcnr
added
waiting-on-review
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rust-lang/rust#87280 now landed so this is ready for review/merge. |
nikomatsakis
approved these changes
Sep 17, 2021
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Should we link this somehow from the TOC? or connect the content in some way with the rest of the guide? |
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opened #1213 |
ehuss
added a commit
to ehuss/rust
that referenced
this pull request
Sep 30, 2021
Update books ## nomicon 1 commits in fe6227eb3c8533200c52dffa42ef1b6f2f02c40e..2747c4bb2cbc0639b733793ddb0bf4e9daa2634e 2021-08-31 05:42:38 +0900 to 2021-09-19 17:33:32 +0900 - Clarify a bit of wording (rust-lang/nomicon#310) ## reference 2 commits in 0e5ed7a4bec065f0cc18c35d1c904639e095314d..13747275bd14c2d2b453100498532f9ae5504769 2021-08-29 17:33:21 +0900 to 2021-09-24 17:44:04 +0900 - (rust-lang/reference#1087) - Document RangeFrom patterns (rust-lang/reference#900) ## book 4 commits in fcb5e0ea68112d85a1d29a7a7335978ef2a02181..eb1282ec444db94055fa9531b6f3f803e86bb382 2021-08-31 21:26:19 -0400 to 2021-09-16 21:17:09 -0400 - Rust 1.55 (rust-lang/book#2890) - Chapter 3.3: Remove unused variable (rust-lang/book#2877) - Appendix (operators and symbols): remove extra space (rust-lang/book#2876) - Chapter 17.1: add missing comma (rust-lang/book#2867) ## rust-by-example 2 commits in 9d4132b56c4999cd3ce1aeca5f1b2f2cb0d11c24..28aca4a36962c709bce301c03114b5589381dfb8 2021-09-14 06:56:00 -0300 to 2021-09-25 08:19:51 -0300 - fix formatting (rust-lang/rust-by-example#1463) - involving === verb, involved === adjective (rust-lang/rust-by-example#1461) ## rustc-dev-guide 7 commits in 9198465b6ca8bed669df0cbb67c0e6d0b140803c..d1f03cbaa39d9164f5fe4b9b93762668142e0dad 2021-09-12 11:50:44 -0500 to 2021-09-24 12:00:29 +0900 - Fix a typo on closure.md (rust-lang/rustc-dev-guide#1218) - const generics update - s/--blessed/--bless/ - Make indentation consistent in example vscode config file - Suggests `--edition=2018` argument when using stage0/bin/rustfmt directly - `ty::Unevaluated`: dealing with unused substs (rust-lang/rustc-dev-guide#1190) - Parallel codegen (rust-lang/rustc-dev-guide#1206)
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blocked on rust-lang/rust#87280
still not too happy with what I wrote here, pls review ❤️