Update cold and inline to use the attribute template
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I didn't feel like this section was pulling its weight. It also wasn't entirely correct.
This adds some wording that was removed from the "optimization hints" section.
This rule did not seem to be covered elsewhere. I'm not 100% positive this is the best way to document this, but I think it is accurate. This is implemented in https://github.com/rust-lang/rust/blob/5526a2f47cd676ceeedc08cf71ae75ce2e9284ae/compiler/rustc_passes/src/check_attr.rs#L482-L497
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Note in particular that `inline` and similar attributes can be applied to `async` blocks as well as to closures. Along with the editorial revisions, let's say that and also discuss the current limitations that affect how these can be applied.
On lang, we had earlier made a decision about how `inline` should apply to `async fn`. Let's document that here.
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Update books ## rust-lang/nomicon 1 commits in 57ed4473660565d9357fcae176b358d7e8724ebf..f17a018b9989430967d1c58e9a12c51169abc744 2025-09-05 22:46:58 UTC to 2025-09-05 22:46:58 UTC - Add missing "C" ABI to FFI example code (rust-lang/nomicon#501) ## rust-lang/reference 7 commits in 89f67b3c1b904cbcd9ed55e443d6fc67c8ca2769..b3ce60628c6f55ab8ff3dba9f3d20203df1c0dee 2025-09-05 20:14:36 UTC to 2025-08-26 20:17:24 UTC - Ensure all lexical elements are SCREAMING_CASE (rust-lang/reference#1990) - Link out to the notation from grammar summary (rust-lang/reference#1989) - Or-patterns are extending (rust-lang/reference#1975) - Specify lifetime extension of `match` arms and `if` consequent/`else` block tail expressions (rust-lang/reference#1981) - clean up and properly test temporary lifetime extension in doctests (rust-lang/reference#1979) - Update `cold` and `inline` to use the attribute template (rust-lang/reference#1907) - Pluralize "syntax diagrams" (rust-lang/reference#1977) ## rust-lang/rust-by-example 1 commits in ad27f82c18464525c761a4a8db2e01785da59e1f..dd26bc8e726dc2e73534c8972d4dccd1bed7495f 2025-09-04 22:33:29 UTC to 2025-09-04 22:33:29 UTC - Fix drop order explanation in trait > drop (rust-lang/rust-by-example#1953)
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Update books ## rust-lang/nomicon 1 commits in 57ed4473660565d9357fcae176b358d7e8724ebf..f17a018b9989430967d1c58e9a12c51169abc744 2025-09-05 22:46:58 UTC to 2025-09-05 22:46:58 UTC - Add missing "C" ABI to FFI example code (rust-lang/nomicon#501) ## rust-lang/reference 7 commits in 89f67b3c1b904cbcd9ed55e443d6fc67c8ca2769..b3ce60628c6f55ab8ff3dba9f3d20203df1c0dee 2025-09-05 20:14:36 UTC to 2025-08-26 20:17:24 UTC - Ensure all lexical elements are SCREAMING_CASE (rust-lang/reference#1990) - Link out to the notation from grammar summary (rust-lang/reference#1989) - Or-patterns are extending (rust-lang/reference#1975) - Specify lifetime extension of `match` arms and `if` consequent/`else` block tail expressions (rust-lang/reference#1981) - clean up and properly test temporary lifetime extension in doctests (rust-lang/reference#1979) - Update `cold` and `inline` to use the attribute template (rust-lang/reference#1907) - Pluralize "syntax diagrams" (rust-lang/reference#1977) ## rust-lang/rust-by-example 1 commits in ad27f82c18464525c761a4a8db2e01785da59e1f..dd26bc8e726dc2e73534c8972d4dccd1bed7495f 2025-09-04 22:33:29 UTC to 2025-09-04 22:33:29 UTC - Fix drop order explanation in trait > drop (rust-lang/rust-by-example#1953)
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Update books ## rust-lang/nomicon 1 commits in 57ed4473660565d9357fcae176b358d7e8724ebf..f17a018b9989430967d1c58e9a12c51169abc744 2025-09-05 22:46:58 UTC to 2025-09-05 22:46:58 UTC - Add missing "C" ABI to FFI example code (rust-lang/nomicon#501) ## rust-lang/reference 7 commits in 89f67b3c1b904cbcd9ed55e443d6fc67c8ca2769..b3ce60628c6f55ab8ff3dba9f3d20203df1c0dee 2025-09-05 20:14:36 UTC to 2025-08-26 20:17:24 UTC - Ensure all lexical elements are SCREAMING_CASE (rust-lang/reference#1990) - Link out to the notation from grammar summary (rust-lang/reference#1989) - Or-patterns are extending (rust-lang/reference#1975) - Specify lifetime extension of `match` arms and `if` consequent/`else` block tail expressions (rust-lang/reference#1981) - clean up and properly test temporary lifetime extension in doctests (rust-lang/reference#1979) - Update `cold` and `inline` to use the attribute template (rust-lang/reference#1907) - Pluralize "syntax diagrams" (rust-lang/reference#1977) ## rust-lang/rust-by-example 1 commits in ad27f82c18464525c761a4a8db2e01785da59e1f..dd26bc8e726dc2e73534c8972d4dccd1bed7495f 2025-09-04 22:33:29 UTC to 2025-09-04 22:33:29 UTC - Fix drop order explanation in trait > drop (rust-lang/rust-by-example#1953)
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Rollup merge of #146339 - rustbot:docs-update, r=ehuss Update books ## rust-lang/nomicon 1 commits in 57ed4473660565d9357fcae176b358d7e8724ebf..f17a018b9989430967d1c58e9a12c51169abc744 2025-09-05 22:46:58 UTC to 2025-09-05 22:46:58 UTC - Add missing "C" ABI to FFI example code (rust-lang/nomicon#501) ## rust-lang/reference 7 commits in 89f67b3c1b904cbcd9ed55e443d6fc67c8ca2769..b3ce60628c6f55ab8ff3dba9f3d20203df1c0dee 2025-09-05 20:14:36 UTC to 2025-08-26 20:17:24 UTC - Ensure all lexical elements are SCREAMING_CASE (rust-lang/reference#1990) - Link out to the notation from grammar summary (rust-lang/reference#1989) - Or-patterns are extending (rust-lang/reference#1975) - Specify lifetime extension of `match` arms and `if` consequent/`else` block tail expressions (rust-lang/reference#1981) - clean up and properly test temporary lifetime extension in doctests (rust-lang/reference#1979) - Update `cold` and `inline` to use the attribute template (rust-lang/reference#1907) - Pluralize "syntax diagrams" (rust-lang/reference#1977) ## rust-lang/rust-by-example 1 commits in ad27f82c18464525c761a4a8db2e01785da59e1f..dd26bc8e726dc2e73534c8972d4dccd1bed7495f 2025-09-04 22:33:29 UTC to 2025-09-04 22:33:29 UTC - Fix drop order explanation in trait > drop (rust-lang/rust-by-example#1953)
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New rules:
attributes.codegen.inline.syntaxattributes.codegen.inline.allowed-positionsattributes.codegen.inline.duplicatesattributes.codegen.inline.traitattributes.codegen.inline.externally-exportedattributes.codegen.cold.introattributes.codegen.cold.syntaxattributes.codegen.cold.allowed-positionsattributes.codegen.cold.duplicatesattributes.codegen.cold.traitRemoved rules:
attributes.codegen.hintattributes.codegen.hint.cold-inlineattributes.codegen.hint.usage--- split into the corresponding attributes