Remove `&mut` from `io::read_to_string` signature ``@m-ou-se`` [realized][1] that because `Read` is implemented for `&mut impl Read`, there's no need to take `&mut` in `io::read_to_string`. Removing the `&mut` from the signature allows users to remove the `&mut` from their calls (and thus pass an owned reader) if they don't use the reader later. r? `@m-ou-se` [1]: https://github.com/rust-lang/rust/issues/80218#issuecomment-874322129 |
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