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Tracking issue for `Captures` trait #56046
Github is making the comments a nuisance to navigate. Is there a cliff-notes version of how this is different from
(I imagine that, since it's a trait bound, it introduces invariance over
@ExpHP I still don't 100% Niko's comment, but I think you're roughly right at least. It's definitely related to invariance somehow. Here is the comment, reproduced.