Remove outdated info about impl Trait in parameters and generics in the same function #1495
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traviscross
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Jun 18, 2024
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Thanks @drewtato for the PR. We reviewed this in the rustdocs meeting and this looks good to us.
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I added a link to rust-lang/cargo#8736 to follow up on the comments you have about the semver compatibility of impl trait and generics. |
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Update books ## rust-lang/book 2 commits in 45c1a6d69edfd1fc91fb7504cb73958dbd09441e..f1e49bf7a8ea6c31ce016a52b8a4f6e1ffcfbc64 2024-06-25 21:12:15 UTC to 2024-06-20 16:10:32 UTC - Update ch10-00-generics.md (rust-lang/book#3963) - infra: ignore Nova configuration directory (rust-lang/book#3962) ## rust-lang/edition-guide 3 commits in cb58c430b4e8054c2cb81d2d4434092c482a93d8..941db8b3df45fd46cd87b50a5c86714b91dcde9c 2024-06-30 19:26:27 UTC to 2024-06-20 18:43:18 UTC - Add a section for the never type change in e2024 (rust-lang/edition-guide#310) - Add 2024 unsafe attributes. (rust-lang/edition-guide#308) - Add 2024 unsafe extern blocks. (rust-lang/edition-guide#309) ## rust-lang/reference 7 commits in 0b805c65804019b0ac8f2fe3117afad82a6069b8..1ae3deebc3ac16e276b6558e01420f8e605def08 2024-06-29 16:59:51 UTC to 2024-06-18 22:16:37 UTC - Provide an example of `target_family` being multi-valued (rust-lang/reference#1518) - Remove stubs needed for the link checker. (rust-lang/reference#1517) - Document new `#[expect]` attribute and `reasons` parameter (RFC 2383) (rust-lang/reference#1237) - Update recognized tool attributes (rust-lang/reference#1498) - Add example of 1-ary tuple type (rust-lang/reference#1514) - underscore-expr: add more examples (rust-lang/reference#1478) - Remove outdated info about impl Trait in parameters and generics in the same function (rust-lang/reference#1495) ## rust-lang/rust-by-example 4 commits in b1d97bd6113aba732b2091ce093c76f2d05bb8a0..658c6c27cb975b92227936024816986c2d3716fb 2024-06-30 11:58:29 UTC to 2024-06-30 11:52:38 UTC - Remove awkward match in if_let (rust-lang/rust-by-example#1725) - Edit grammatical mistake (rust-lang/rust-by-example#1830) - Update paragraph in src/fn/diverging.md (rust-lang/rust-by-example#1853) - Fix minor typo in from_into.md (rust-lang/rust-by-example#1854) ## rust-lang/rustc-dev-guide 11 commits in aec8216..d6e3a32 2024-07-01 10:51:26 UTC to 2024-06-18 18:24:17 UTC - Update new target check-cfg instructions (rust-lang/rustc-dev-guide#2006) - Add Rust for Linux integration tests documentation (rust-lang/rustc-dev-guide#2004) - Add docs for building Fuchsia locally and in CI (rust-lang/rustc-dev-guide#1989) - provide `libstdc++.so.6` through `LD_LIBRARY_PATH` (rust-lang/rustc-dev-guide#1999) - Document how to run `run-make` tests on Windows (rust-lang/rustc-dev-guide#2002) - Document `needs-symlink` directive (rust-lang/rustc-dev-guide#2001) - Rename `wasm32-wasi` to `wasm32-wasip1` (rust-lang/rustc-dev-guide#1678) - Document inert vs active attributes (rust-lang/rustc-dev-guide#1110) - Document hard-resetting submodules (rust-lang/rustc-dev-guide#2000) - Fix note about compiletest header `rustfix-only-machine-applicable` (rust-lang/rustc-dev-guide#1998) - Mention `RUSTC_ICE=0` to suppress ICE file (rust-lang/rustc-dev-guide#1997)
rust-timer
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Jul 2, 2024
Rollup merge of rust-lang#127212 - rustbot:docs-update, r=ehuss Update books ## rust-lang/book 2 commits in 45c1a6d69edfd1fc91fb7504cb73958dbd09441e..f1e49bf7a8ea6c31ce016a52b8a4f6e1ffcfbc64 2024-06-25 21:12:15 UTC to 2024-06-20 16:10:32 UTC - Update ch10-00-generics.md (rust-lang/book#3963) - infra: ignore Nova configuration directory (rust-lang/book#3962) ## rust-lang/edition-guide 3 commits in cb58c430b4e8054c2cb81d2d4434092c482a93d8..941db8b3df45fd46cd87b50a5c86714b91dcde9c 2024-06-30 19:26:27 UTC to 2024-06-20 18:43:18 UTC - Add a section for the never type change in e2024 (rust-lang/edition-guide#310) - Add 2024 unsafe attributes. (rust-lang/edition-guide#308) - Add 2024 unsafe extern blocks. (rust-lang/edition-guide#309) ## rust-lang/reference 7 commits in 0b805c65804019b0ac8f2fe3117afad82a6069b8..1ae3deebc3ac16e276b6558e01420f8e605def08 2024-06-29 16:59:51 UTC to 2024-06-18 22:16:37 UTC - Provide an example of `target_family` being multi-valued (rust-lang/reference#1518) - Remove stubs needed for the link checker. (rust-lang/reference#1517) - Document new `#[expect]` attribute and `reasons` parameter (RFC 2383) (rust-lang/reference#1237) - Update recognized tool attributes (rust-lang/reference#1498) - Add example of 1-ary tuple type (rust-lang/reference#1514) - underscore-expr: add more examples (rust-lang/reference#1478) - Remove outdated info about impl Trait in parameters and generics in the same function (rust-lang/reference#1495) ## rust-lang/rust-by-example 4 commits in b1d97bd6113aba732b2091ce093c76f2d05bb8a0..658c6c27cb975b92227936024816986c2d3716fb 2024-06-30 11:58:29 UTC to 2024-06-30 11:52:38 UTC - Remove awkward match in if_let (rust-lang/rust-by-example#1725) - Edit grammatical mistake (rust-lang/rust-by-example#1830) - Update paragraph in src/fn/diverging.md (rust-lang/rust-by-example#1853) - Fix minor typo in from_into.md (rust-lang/rust-by-example#1854) ## rust-lang/rustc-dev-guide 11 commits in aec8216..d6e3a32 2024-07-01 10:51:26 UTC to 2024-06-18 18:24:17 UTC - Update new target check-cfg instructions (rust-lang/rustc-dev-guide#2006) - Add Rust for Linux integration tests documentation (rust-lang/rustc-dev-guide#2004) - Add docs for building Fuchsia locally and in CI (rust-lang/rustc-dev-guide#1989) - provide `libstdc++.so.6` through `LD_LIBRARY_PATH` (rust-lang/rustc-dev-guide#1999) - Document how to run `run-make` tests on Windows (rust-lang/rustc-dev-guide#2002) - Document `needs-symlink` directive (rust-lang/rustc-dev-guide#2001) - Rename `wasm32-wasi` to `wasm32-wasip1` (rust-lang/rustc-dev-guide#1678) - Document inert vs active attributes (rust-lang/rustc-dev-guide#1110) - Document hard-resetting submodules (rust-lang/rustc-dev-guide#2000) - Fix note about compiletest header `rustfix-only-machine-applicable` (rust-lang/rustc-dev-guide#1998) - Mention `RUSTC_ICE=0` to suppress ICE file (rust-lang/rustc-dev-guide#1997)
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Update books ## rust-lang/book 2 commits in 45c1a6d69edfd1fc91fb7504cb73958dbd09441e..f1e49bf7a8ea6c31ce016a52b8a4f6e1ffcfbc64 2024-06-25 21:12:15 UTC to 2024-06-20 16:10:32 UTC - Update ch10-00-generics.md (rust-lang/book#3963) - infra: ignore Nova configuration directory (rust-lang/book#3962) ## rust-lang/edition-guide 3 commits in cb58c430b4e8054c2cb81d2d4434092c482a93d8..941db8b3df45fd46cd87b50a5c86714b91dcde9c 2024-06-30 19:26:27 UTC to 2024-06-20 18:43:18 UTC - Add a section for the never type change in e2024 (rust-lang/edition-guide#310) - Add 2024 unsafe attributes. (rust-lang/edition-guide#308) - Add 2024 unsafe extern blocks. (rust-lang/edition-guide#309) ## rust-lang/reference 7 commits in 0b805c65804019b0ac8f2fe3117afad82a6069b8..1ae3deebc3ac16e276b6558e01420f8e605def08 2024-06-29 16:59:51 UTC to 2024-06-18 22:16:37 UTC - Provide an example of `target_family` being multi-valued (rust-lang/reference#1518) - Remove stubs needed for the link checker. (rust-lang/reference#1517) - Document new `#[expect]` attribute and `reasons` parameter (RFC 2383) (rust-lang/reference#1237) - Update recognized tool attributes (rust-lang/reference#1498) - Add example of 1-ary tuple type (rust-lang/reference#1514) - underscore-expr: add more examples (rust-lang/reference#1478) - Remove outdated info about impl Trait in parameters and generics in the same function (rust-lang/reference#1495) ## rust-lang/rust-by-example 4 commits in b1d97bd6113aba732b2091ce093c76f2d05bb8a0..658c6c27cb975b92227936024816986c2d3716fb 2024-06-30 11:58:29 UTC to 2024-06-30 11:52:38 UTC - Remove awkward match in if_let (rust-lang/rust-by-example#1725) - Edit grammatical mistake (rust-lang/rust-by-example#1830) - Update paragraph in src/fn/diverging.md (rust-lang/rust-by-example#1853) - Fix minor typo in from_into.md (rust-lang/rust-by-example#1854) ## rust-lang/rustc-dev-guide 11 commits in aec82168dd3121289a194b381f56076fc789a4d2..d6e3a32a557db5902e714604def8015d6bb7e0f7 2024-07-01 10:51:26 UTC to 2024-06-18 18:24:17 UTC - Update new target check-cfg instructions (rust-lang/rustc-dev-guide#2006) - Add Rust for Linux integration tests documentation (rust-lang/rustc-dev-guide#2004) - Add docs for building Fuchsia locally and in CI (rust-lang/rustc-dev-guide#1989) - provide `libstdc++.so.6` through `LD_LIBRARY_PATH` (rust-lang/rustc-dev-guide#1999) - Document how to run `run-make` tests on Windows (rust-lang/rustc-dev-guide#2002) - Document `needs-symlink` directive (rust-lang/rustc-dev-guide#2001) - Rename `wasm32-wasi` to `wasm32-wasip1` (rust-lang/rustc-dev-guide#1678) - Document inert vs active attributes (rust-lang/rustc-dev-guide#1110) - Document hard-resetting submodules (rust-lang/rustc-dev-guide#2000) - Fix note about compiletest header `rustfix-only-machine-applicable` (rust-lang/rustc-dev-guide#1998) - Mention `RUSTC_ICE=0` to suppress ICE file (rust-lang/rustc-dev-guide#1997)
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When
impl Traitin function parameters was added, it was not allowed to specify generics at all when any of the function parameters usedimpl Trait. That is no longer the case. This restriction was lifted in 1.63.0 by rust-lang/rust#96868, but this instance in the reference was missed. I've removed the outdated sentences.The original last line:
would be correct, but even in the old version, it didn't explain how converting
impl Traitto generics could be a breaking change, and I can't think of any way it would've been. It is now, so I've added a short explanation that should be sufficient for understanding.I have some more thoughts about breaking changes, but I don't think they belong in this part of the reference. I've included them as context for the change, and in case someone wants to incorporate them elsewhere.
These are the situations I know to be breaking changes:
impl Trait, and a caller is specifying genericsimpl Traitparameter is changed to a generic, and a caller is specifying genericsThis assumes the trait bound is the same for the generic and its corresponding
impl Trait. If a caller isn't specifying generics, any change can be made without causing a break. If a function had no generics and animpl Traitis changed to a generic, this is also fine, since an empty turbofish::<>seems to be equivalent to complete omission instead of "exactly zero generics". This would only realistically occur in macro expansions. However, I'm unsure if it's intended as part of the language, and I didn't see any mention of it elsewhere in the reference.