Commit d48dff9
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Rollup merge of #153204 - xtqqczze:must-use-map, r=Amanieu,joboet
Add `#[must_use]` attribute to `HashMap` and `HashSet` constructors
- `new_in`
- `with_capacity_and_hasher`
- `with_capacity_and_hasher_in`
- `with_hasher`
- `with_hasher_in`
See also: rust-lang/rust#896920 file changed
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