Some small nits to the borrowck suggestions for mutating a map through index #134945
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compiler-errors
commented
Dec 31, 2024
| = help: to modify a `HashMap<&str, String>`, use `.get_mut()`, `.insert()` or the entry API | ||
| help: to modify a `HashMap<&str, String>` use `.get_mut()` | ||
| | | ||
| LL | if let Some(val) = map.get_mut("peter") { val.clear(); }; |
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Very annoying to suggest removing that ;, so I'm gonna leave that out. It doesn't hurt.
lqd
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Dec 31, 2024
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Zalathar
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…=estebank
Some small nits to the borrowck suggestions for mutating a map through index
1. Suggesting users to either use `.insert` or `.get_mut` (which do totally different things) can be a bit of a footgun, so let's make that a bit more nuanced.
2. I find the suggestion of `.get_mut(|val| { *val = whatever; })` to be a bit awkward. I changed this to be an if-let instead.
3. Fix a bug which was suppressing the structured suggestion for some mutations via the index operator on `HashMap`/`BTreeMap`.
r? estebank or reassign
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Rollup of 7 pull requests Successful merges: - rust-lang#131439 (Remove allowing static_mut_refs lint) - rust-lang#133292 (E0277: suggest dereferencing function arguments in more cases) - rust-lang#134080 (Avoid use of LFS64 symbols on Emscripten) - rust-lang#134877 (add suggestion for wrongly ordered format parameters) - rust-lang#134926 (Update books) - rust-lang#134945 (Some small nits to the borrowck suggestions for mutating a map through index) - rust-lang#134979 (Provide structured suggestion for `impl Default` of type where all fields have defaults) r? `@ghost` `@rustbot` modify labels: rollup
bors
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Rollup of 6 pull requests Successful merges: - rust-lang#131439 (Remove allowing static_mut_refs lint) - rust-lang#133292 (E0277: suggest dereferencing function arguments in more cases) - rust-lang#134877 (add suggestion for wrongly ordered format parameters) - rust-lang#134945 (Some small nits to the borrowck suggestions for mutating a map through index) - rust-lang#134950 (bootstrap: Overhaul and simplify the `tool_check_step!` macro) - rust-lang#134979 (Provide structured suggestion for `impl Default` of type where all fields have defaults) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#134945 - compiler-errors:map-mutate-nits, r=estebank Some small nits to the borrowck suggestions for mutating a map through index 1. Suggesting users to either use `.insert` or `.get_mut` (which do totally different things) can be a bit of a footgun, so let's make that a bit more nuanced. 2. I find the suggestion of `.get_mut(|val| { *val = whatever; })` to be a bit awkward. I changed this to be an if-let instead. 3. Fix a bug which was suppressing the structured suggestion for some mutations via the index operator on `HashMap`/`BTreeMap`. r? estebank or reassign
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.insertor.get_mut(which do totally different things) can be a bit of a footgun, so let's make that a bit more nuanced..get_mut(|val| { *val = whatever; })to be a bit awkward. I changed this to be an if-let instead.HashMap/BTreeMap.r? estebank or reassign