Two mut Refs at the same time

[chpio]

as_owner_mut creates an additional mut ref to the stored ref, so we end up having two mutable ref at the same time. Why is this allowed? Changing data thru the mut ref should at least invalidate the stored ref (which is achievable by using the into_owned method -> mutating the owner -> making an OwningRefMut and mapping it again).

http://kimundi.github.io/owning-ref-rs/owning_ref/struct.OwningRefMut.html#method.as_owner_mut

[Storyyeller]

into_owner takes Self, so you can't call it after calling as_owner_mut.

[chpio]

@Storyyeller Yeah? I was saying that it should be used instead of as_owner_mut.

[Storyyeller]

I thought you were saying that you had found a soundness hole. Have you?

[chpio]

https://gist.github.com/rust-play/05def43b325e835d50cc97a1016c3c6f

edit: made code compile on rust stable. the hole is reproducible on nightly (rustc 1.31.0-nightly (424a749a0 2018-10-21)) and stable (rustc 1.29.2 (17a9dc751 2018-10-05))

[chpio]

*bump*

i guess a simple fix would be to remove as_owner_mut?