Rollup merge of #69661 - lopopolo:string-from-mut-str, r=sfackler
Implement From<&mut str> for String I ran into this missing impl when trying to do `String::from` on the result returned from this API in the `uuid` crate: https://docs.rs/uuid/0.8.1/uuid/adapter/struct.Hyphenated.html#method.encode_lower I wasn't sure what to put in the stability annotation. I'd appreciate some help with that :)
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