rust-lang/rust-clippy

Catch transmuting Option<&T> to Option<&mut T>

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#372 ouverte le 8 oct. 2015

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Description

Rustc already has a lint (mutable_transmutes) that catches transmutes from &T to &mut T, which can cause undefined behaviour. However, it doesn't catch minor variations of this problem, like Option<&T> -> Option<&mut T>, which are presumably just as dangerous. I've seen this particular example in real code. It would be nice to have a lint that catches this case (and ideally, other instances of the same problem, although this could get quite complex in the fully general case).

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