Document assignment expression as coercion site#1954
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ehuss merged 1 commit intorust-lang:masterfrom Feb 19, 2026
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Thanks! This seems correct to me. I'm also feeling like the coercion site listing is also missing all of the bin operators. Can someone at @rust-lang/types maybe give this a quick review? And let us know if it would make sense to also include bin ops, too, and if there are any complications are caveats around those. (The code for that seems a bit more tricky to follow.) |
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This looks correct. I'm not sure about bin ops in general. |
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Thanks for taking a look! I'm happy to see this gaining some traction as it's such a simple gap to get filled out. I don't think binary operators needs to be mentioned as they can be understood by their desugaring. E.g., |
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Update books ## rust-embedded/book 1 commits in fe88fbb68391a465680dd91109f0a151a1676f3e..99d0341ff4e06757490af8fceee790c4ede50bc0 2026-02-11 12:58:13 UTC to 2026-02-11 12:58:13 UTC - Remove triagebot.toml (rust-embedded/book#405) ## rust-lang/reference 21 commits in addd0602c819b6526b9cc97653b0fadca395528c..442cbef9105662887d5eae2882ca551f3726bf28 2026-02-22 02:55:12 UTC to 2026-02-11 01:41:05 UTC - Document importing path-segment keyword (rust-lang/reference#2136) - avoid needless dereference (rust-lang/reference#2180) - Use `clobber_abi`s corresponding to the called functions in `[asm.abi-clobbers.many]`'s example. (rust-lang/reference#2170) - expr.paren.evaluation: fix and make more simple (rust-lang/reference#2158) - const-eval.const-context.outer-generics: make more clear/obvious (rust-lang/reference#2159) - Nightly test links: update rust branch name (use `main`) (rust-lang/reference#2185) - tools/xtask: update rust branch name for linkcheck script (use `main`) (rust-lang/reference#2184) - specify `if let` guards with updated scoping rules (rust-lang/reference#1957) - Document assignment expression as coercion site (rust-lang/reference#1954) - Remove exception WRT same-crate `non_exhaustive` reads (rust-lang/reference#2162) - Add negative lookahead (rust-lang/reference#2172) - Switch to new range syntax (rust-lang/reference#2173) - add mdbook output for dev-guide to ignore file (rust-lang/reference#2178) - Fix rule name for while syntax (rust-lang/reference#2175) - block-expr: add new rule expr.block.result-value (rust-lang/reference#2174) - lifetime-elision.md: add some missing periods (rust-lang/reference#2176) - Add cut operator (`^`) to grammar (rust-lang/reference#2104) - dev-guide stabilization.md: add missing "not" (rust-lang/reference#2167) - Add method call and await expr for Dot in syntax index (rust-lang/reference#2163) - Fix sort of punctuation list (rust-lang/reference#2161) - Add a contributor guide (rust-lang/reference#2097) ## rust-lang/rust-by-example 1 commits in bac931ef1673af63fb60c3d691633034713cca20..5383db524711c0c9c43c3ca9e5e706089672ed6a 2026-02-16 12:02:33 UTC to 2026-02-16 12:02:33 UTC - 1.2.2 Display: Fix typo in bonus instructions (before -> after) (rust-lang/rust-by-example#1998)
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Update books ## rust-embedded/book 1 commits in fe88fbb68391a465680dd91109f0a151a1676f3e..99d0341ff4e06757490af8fceee790c4ede50bc0 2026-02-11 12:58:13 UTC to 2026-02-11 12:58:13 UTC - Remove triagebot.toml (rust-embedded/book#405) ## rust-lang/reference 21 commits in addd0602c819b6526b9cc97653b0fadca395528c..442cbef9105662887d5eae2882ca551f3726bf28 2026-02-22 02:55:12 UTC to 2026-02-11 01:41:05 UTC - Document importing path-segment keyword (rust-lang/reference#2136) - avoid needless dereference (rust-lang/reference#2180) - Use `clobber_abi`s corresponding to the called functions in `[asm.abi-clobbers.many]`'s example. (rust-lang/reference#2170) - expr.paren.evaluation: fix and make more simple (rust-lang/reference#2158) - const-eval.const-context.outer-generics: make more clear/obvious (rust-lang/reference#2159) - Nightly test links: update rust branch name (use `main`) (rust-lang/reference#2185) - tools/xtask: update rust branch name for linkcheck script (use `main`) (rust-lang/reference#2184) - specify `if let` guards with updated scoping rules (rust-lang/reference#1957) - Document assignment expression as coercion site (rust-lang/reference#1954) - Remove exception WRT same-crate `non_exhaustive` reads (rust-lang/reference#2162) - Add negative lookahead (rust-lang/reference#2172) - Switch to new range syntax (rust-lang/reference#2173) - add mdbook output for dev-guide to ignore file (rust-lang/reference#2178) - Fix rule name for while syntax (rust-lang/reference#2175) - block-expr: add new rule expr.block.result-value (rust-lang/reference#2174) - lifetime-elision.md: add some missing periods (rust-lang/reference#2176) - Add cut operator (`^`) to grammar (rust-lang/reference#2104) - dev-guide stabilization.md: add missing "not" (rust-lang/reference#2167) - Add method call and await expr for Dot in syntax index (rust-lang/reference#2163) - Fix sort of punctuation list (rust-lang/reference#2161) - Add a contributor guide (rust-lang/reference#2097) ## rust-lang/rust-by-example 1 commits in bac931ef1673af63fb60c3d691633034713cca20..5383db524711c0c9c43c3ca9e5e706089672ed6a 2026-02-16 12:02:33 UTC to 2026-02-16 12:02:33 UTC - 1.2.2 Display: Fix typo in bonus instructions (before -> after) (rust-lang/rust-by-example#1998)
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Update books ## rust-embedded/book 1 commits in fe88fbb68391a465680dd91109f0a151a1676f3e..99d0341ff4e06757490af8fceee790c4ede50bc0 2026-02-11 12:58:13 UTC to 2026-02-11 12:58:13 UTC - Remove triagebot.toml (rust-embedded/book#405) ## rust-lang/reference 21 commits in addd0602c819b6526b9cc97653b0fadca395528c..442cbef9105662887d5eae2882ca551f3726bf28 2026-02-22 02:55:12 UTC to 2026-02-11 01:41:05 UTC - Document importing path-segment keyword (rust-lang/reference#2136) - avoid needless dereference (rust-lang/reference#2180) - Use `clobber_abi`s corresponding to the called functions in `[asm.abi-clobbers.many]`'s example. (rust-lang/reference#2170) - expr.paren.evaluation: fix and make more simple (rust-lang/reference#2158) - const-eval.const-context.outer-generics: make more clear/obvious (rust-lang/reference#2159) - Nightly test links: update rust branch name (use `main`) (rust-lang/reference#2185) - tools/xtask: update rust branch name for linkcheck script (use `main`) (rust-lang/reference#2184) - specify `if let` guards with updated scoping rules (rust-lang/reference#1957) - Document assignment expression as coercion site (rust-lang/reference#1954) - Remove exception WRT same-crate `non_exhaustive` reads (rust-lang/reference#2162) - Add negative lookahead (rust-lang/reference#2172) - Switch to new range syntax (rust-lang/reference#2173) - add mdbook output for dev-guide to ignore file (rust-lang/reference#2178) - Fix rule name for while syntax (rust-lang/reference#2175) - block-expr: add new rule expr.block.result-value (rust-lang/reference#2174) - lifetime-elision.md: add some missing periods (rust-lang/reference#2176) - Add cut operator (`^`) to grammar (rust-lang/reference#2104) - dev-guide stabilization.md: add missing "not" (rust-lang/reference#2167) - Add method call and await expr for Dot in syntax index (rust-lang/reference#2163) - Fix sort of punctuation list (rust-lang/reference#2161) - Add a contributor guide (rust-lang/reference#2097) ## rust-lang/rust-by-example 1 commits in bac931ef1673af63fb60c3d691633034713cca20..5383db524711c0c9c43c3ca9e5e706089672ed6a 2026-02-16 12:02:33 UTC to 2026-02-16 12:02:33 UTC - 1.2.2 Display: Fix typo in bonus instructions (before -> after) (rust-lang/rust-by-example#1998)
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Rollup merge of #153023 - rustbot:docs-update, r=ehuss Update books ## rust-embedded/book 1 commits in fe88fbb68391a465680dd91109f0a151a1676f3e..99d0341ff4e06757490af8fceee790c4ede50bc0 2026-02-11 12:58:13 UTC to 2026-02-11 12:58:13 UTC - Remove triagebot.toml (rust-embedded/book#405) ## rust-lang/reference 21 commits in addd0602c819b6526b9cc97653b0fadca395528c..442cbef9105662887d5eae2882ca551f3726bf28 2026-02-22 02:55:12 UTC to 2026-02-11 01:41:05 UTC - Document importing path-segment keyword (rust-lang/reference#2136) - avoid needless dereference (rust-lang/reference#2180) - Use `clobber_abi`s corresponding to the called functions in `[asm.abi-clobbers.many]`'s example. (rust-lang/reference#2170) - expr.paren.evaluation: fix and make more simple (rust-lang/reference#2158) - const-eval.const-context.outer-generics: make more clear/obvious (rust-lang/reference#2159) - Nightly test links: update rust branch name (use `main`) (rust-lang/reference#2185) - tools/xtask: update rust branch name for linkcheck script (use `main`) (rust-lang/reference#2184) - specify `if let` guards with updated scoping rules (rust-lang/reference#1957) - Document assignment expression as coercion site (rust-lang/reference#1954) - Remove exception WRT same-crate `non_exhaustive` reads (rust-lang/reference#2162) - Add negative lookahead (rust-lang/reference#2172) - Switch to new range syntax (rust-lang/reference#2173) - add mdbook output for dev-guide to ignore file (rust-lang/reference#2178) - Fix rule name for while syntax (rust-lang/reference#2175) - block-expr: add new rule expr.block.result-value (rust-lang/reference#2174) - lifetime-elision.md: add some missing periods (rust-lang/reference#2176) - Add cut operator (`^`) to grammar (rust-lang/reference#2104) - dev-guide stabilization.md: add missing "not" (rust-lang/reference#2167) - Add method call and await expr for Dot in syntax index (rust-lang/reference#2163) - Fix sort of punctuation list (rust-lang/reference#2161) - Add a contributor guide (rust-lang/reference#2097) ## rust-lang/rust-by-example 1 commits in bac931ef1673af63fb60c3d691633034713cca20..5383db524711c0c9c43c3ca9e5e706089672ed6a 2026-02-16 12:02:33 UTC to 2026-02-16 12:02:33 UTC - 1.2.2 Display: Fix typo in bonus instructions (before -> after) (rust-lang/rust-by-example#1998)
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I was recently confused as for why this is allowed in Rust
as I couldn't find that documented anywhere.
I was told that assignment expressions are in fact coercion sites which explains the example above.
This PR documents assignment expressions as coercion sites in the reference.