allow rvalue temporaries to be borrowed as &mut #5967
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C-enhancement
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Fixed by #6473. |
flip1995
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Aug 28, 2020
…ay, r=ebroto Fix FP in `to_string_in_display` Don't emit a lint when `.to_string()` on anything that is not `self` Fix rust-lang#5967 changelog: Fix FP in `to_string_in_display` when calling `.to_string()` on anything that is not `self`
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You can currently borrow an rvalue as & or move out of it, but can't borrow it as &mut.
The use case for this is making external iterators more convenient to use by not requiring a temporary. Instead of
let mut it = x.chain(y).zip(z); for it.advance |x| { ... }it could just befor x.chain(y).zip(z).advance |x| { ... }.I've run into this in a few other places but I didn't think twice about it and just did the temporary workaround - but after some thought this seems like an unnecessary restriction.
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