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Rollup merge of rust-lang#70048 - TyPR124:mutable_osstr, r=dtolnay
Allow obtaining &mut OsStr ```rust impl DerefMut for OsString {...} // type Target = OsStr impl IndexMut<RangeFull> for OsString {...} // type Output = OsStr ``` --- This change is pulled out of rust-lang#69937 per @dtolnay This implements `DerefMut for OsString` to allow obtaining a `&mut OsStr`. This also implements `IndexMut for OsString`, which is used by `DerefMut`. This pattern is the same as is used by `Deref`. This is necessary to for methods like `make_ascii_lowercase` which need to mutate the underlying value.
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