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Add Lifetime Capture Rules 2024 #1601

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Nov 25, 2024
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The rules for which generic lifetime parameters are automatically captured in an RPIT-like opaque type are changing in Rust 2024 according to RFC 3498. Let's document these changes.

@traviscross traviscross added the S-waiting-on-stabilization Waiting for a stabilization PR to be merged in the main Rust repository label Sep 3, 2024
@ehuss ehuss added the A-edition-2024 Area: Edition 2024 label Sep 3, 2024
@ehuss ehuss force-pushed the TC/lifetime-capture-rules-2024 branch from 3328fc2 to 898ac44 Compare November 25, 2024 16:10
The rules for which generic lifetime parameters are automatically
captured in an RPIT-like opaque type are changing in Rust 2024
according to RFC 3498.  Let's document these changes.
@ehuss ehuss force-pushed the TC/lifetime-capture-rules-2024 branch from 898ac44 to 3a8bef7 Compare November 25, 2024 16:11
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Thanks!

@ehuss ehuss enabled auto-merge November 25, 2024 16:12
@ehuss ehuss added this pull request to the merge queue Nov 25, 2024
Merged via the queue into master with commit 3b28797 Nov 25, 2024
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bors added a commit to rust-lang-ci/rust that referenced this pull request Nov 25, 2024
Update cargo and books

10 commits in 66221abdeca2002d318fde6efff516aab091df0e..4c39aaff66862cc0da52fe529aa1990bb8bb9a22
2024-11-19 21:30:02 +0000 to 2024-11-25 16:36:17 +0000
- feat: Stabilize Edition 2024 (rust-lang/cargo#14828)
- Improve error handling when PathSource is relative (rust-lang/cargo#14854)
- test: address test output nondeterminism  (rust-lang/cargo#14855)
- chore: move supports-unicode to workspace deps (rust-lang/cargo#14853)
- Check build target supports std when building with -Zbuild-std=std (rust-lang/cargo#14183)
- fix(publish): Allow dry-run of a non-bumped workspace  (rust-lang/cargo#14847)
- test: Switch from 'exec_with_output' to 'run' (rust-lang/cargo#14848)
- test(rustflags): Verify -Cmetadata directly, not through -Cextra-filename (rust-lang/cargo#14846)
- chore: remove bors mentions (rust-lang/cargo#14845)
- Clarify how `cargo::metadata` env var is selected (rust-lang/cargo#14842)

## nomicon

1 commits in eac89a3cbe6c4714e5029ae8b5a1c556fd4e8c42..0674321898cd454764ab69702819d39a919afd68
2024-11-16 14:05:28 +0000 to 2024-11-19 12:35:48 +0000
- races: Clarify a “mostly” that might be misread (rust-lang/nomicon#468)

## reference

12 commits in 41ccb0e6478305401dad92e8fd3d04a4304edb4c..5c86c739ec71b8bc839310ff47fa94e94635bba9
2024-11-15 21:45:16 +0000 to 2024-11-25 17:23:35 +0000
- Document `gen` keyword as reserved in Rust 2024 (rust-lang/reference#1501)
- 2024: Update `expr` macro fragment specifier (rust-lang/reference#1639)
- Add rust_2024 prelude (rust-lang/reference#1552)
- 2024: Add reserved syntax (rust-lang/reference#1652)
- Add Lifetime Capture Rules 2024 (rust-lang/reference#1601)
- Add a section dedicated to Edition 2024 changes to temporary scopes (rust-lang/reference#1592)
- 2024: Add unsafe attribute differences (rust-lang/reference#1579)
- 2024: Add updates for unsafe extern blocks (rust-lang/reference#1565)
- Fix rule for lazy boolean temporary drop scope (rust-lang/reference#1681)
- Raw lifetimes (rust-lang/reference#1603)
- Fix some missing emdashes (rust-lang/reference#1676)
- Added an additional example of lifetime elision (rust-lang/reference#1678)

## rustc-dev-guide

6 commits in b679e71..787b416
2024-11-18 16:18:15 +0800 to 2024-11-22 11:17:57 +0000
- Remove constants section as it is outdated
- Flatten generic parameter defs section
- Add instructions to test error code docs (rust-lang/rustc-dev-guide#2145)
- Reorganize the "Source Code Representation" chapters (rust-lang/rustc-dev-guide#2142)
- Make `Diag` a clickable link in Suggestion section (rust-lang/rustc-dev-guide#2140)
- update for rustc_intrinsic_const_stable_indirect (rust-lang/rustc-dev-guide#2138)

## edition-guide

6 commits in 915f9b319c2823f310430ecdecd86264a7870d7e..f48b0e842a3911c63240e955d042089e9e0894c7
2024-11-06 07:23:07 +0000 to 2024-11-25 16:20:27 +0000
- Update for 2024 stabilization (rust-lang/edition-guide#338)
- Enable triagebot merge-conflicts and shortcuts (rust-lang/edition-guide#336)
- Organize the 2024 chapters into sub-chapters by category (rust-lang/edition-guide#334)
- Fix broken Cargo Book link in cargo-resolver.md (rust-lang/edition-guide#335)
- Edition 2024 guide for temporary lifetime changes (rust-lang/edition-guide#318)
- 2024: rustfmt sorting (rust-lang/edition-guide#332)
bors added a commit to rust-lang-ci/rust that referenced this pull request Nov 26, 2024
Update cargo and books

10 commits in 66221abdeca2002d318fde6efff516aab091df0e..4c39aaff66862cc0da52fe529aa1990bb8bb9a22
2024-11-19 21:30:02 +0000 to 2024-11-25 16:36:17 +0000
- feat: Stabilize Edition 2024 (rust-lang/cargo#14828)
- Improve error handling when PathSource is relative (rust-lang/cargo#14854)
- test: address test output nondeterminism  (rust-lang/cargo#14855)
- chore: move supports-unicode to workspace deps (rust-lang/cargo#14853)
- Check build target supports std when building with -Zbuild-std=std (rust-lang/cargo#14183)
- fix(publish): Allow dry-run of a non-bumped workspace  (rust-lang/cargo#14847)
- test: Switch from 'exec_with_output' to 'run' (rust-lang/cargo#14848)
- test(rustflags): Verify -Cmetadata directly, not through -Cextra-filename (rust-lang/cargo#14846)
- chore: remove bors mentions (rust-lang/cargo#14845)
- Clarify how `cargo::metadata` env var is selected (rust-lang/cargo#14842)

## nomicon

1 commits in eac89a3cbe6c4714e5029ae8b5a1c556fd4e8c42..0674321898cd454764ab69702819d39a919afd68
2024-11-16 14:05:28 +0000 to 2024-11-19 12:35:48 +0000
- races: Clarify a “mostly” that might be misread (rust-lang/nomicon#468)

## reference

12 commits in 41ccb0e6478305401dad92e8fd3d04a4304edb4c..5c86c739ec71b8bc839310ff47fa94e94635bba9
2024-11-15 21:45:16 +0000 to 2024-11-25 17:23:35 +0000
- Document `gen` keyword as reserved in Rust 2024 (rust-lang/reference#1501)
- 2024: Update `expr` macro fragment specifier (rust-lang/reference#1639)
- Add rust_2024 prelude (rust-lang/reference#1552)
- 2024: Add reserved syntax (rust-lang/reference#1652)
- Add Lifetime Capture Rules 2024 (rust-lang/reference#1601)
- Add a section dedicated to Edition 2024 changes to temporary scopes (rust-lang/reference#1592)
- 2024: Add unsafe attribute differences (rust-lang/reference#1579)
- 2024: Add updates for unsafe extern blocks (rust-lang/reference#1565)
- Fix rule for lazy boolean temporary drop scope (rust-lang/reference#1681)
- Raw lifetimes (rust-lang/reference#1603)
- Fix some missing emdashes (rust-lang/reference#1676)
- Added an additional example of lifetime elision (rust-lang/reference#1678)

## rustc-dev-guide

6 commits in b679e71..787b416
2024-11-18 16:18:15 +0800 to 2024-11-22 11:17:57 +0000
- Remove constants section as it is outdated
- Flatten generic parameter defs section
- Add instructions to test error code docs (rust-lang/rustc-dev-guide#2145)
- Reorganize the "Source Code Representation" chapters (rust-lang/rustc-dev-guide#2142)
- Make `Diag` a clickable link in Suggestion section (rust-lang/rustc-dev-guide#2140)
- update for rustc_intrinsic_const_stable_indirect (rust-lang/rustc-dev-guide#2138)

## edition-guide

6 commits in 915f9b319c2823f310430ecdecd86264a7870d7e..f48b0e842a3911c63240e955d042089e9e0894c7
2024-11-06 07:23:07 +0000 to 2024-11-25 16:20:27 +0000
- Update for 2024 stabilization (rust-lang/edition-guide#338)
- Enable triagebot merge-conflicts and shortcuts (rust-lang/edition-guide#336)
- Organize the 2024 chapters into sub-chapters by category (rust-lang/edition-guide#334)
- Fix broken Cargo Book link in cargo-resolver.md (rust-lang/edition-guide#335)
- Edition 2024 guide for temporary lifetime changes (rust-lang/edition-guide#318)
- 2024: rustfmt sorting (rust-lang/edition-guide#332)
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