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regression: array methods unstable feature use #78140
I suspect this is because method resolution is now seeing the method on arrays, whereas previously we derefed to &mut [T] and then there was a trait impl on that? There was another similar issue recently, but I forget what the resolution there was.
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camelid commentedon Oct 21, 2020
Relevant wg-prioritization discussion.
eddyb commentedon Nov 6, 2020
Shouldn't #48552 prevent this from being an issue at all? Do we need to extend it in some way?
cc @nikomatsakis @pnkfelix