Require assoc types to outlive struct they are referenced from #22407
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`no_late_bound_regions().unwrap()`, which allows us to write code that doesn't necessarily *fail* when there are higher-ranked trait bounds.
parameter environments so that it can be used elsewhere.
and extend regionck to drive it.
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Hmm, already thought of one shortcoming. For #22246, I'm not considering supertraits, which I certainly should be doing. |
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Actually, I thought of another shortcoming around HRTB. I'm going to close this PR and re-work it a bit. Nothing like opening a PR to make your mind reveal the problems. |
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This PR includes a bunch of refactoring that was part of an experimental branch implementing [implied bounds]. That particular idea isn't ready to go yet, but the refactoring proved useful for fixing #22246. The implied bounds branch also exposed #22110 so a simple fix for that is included here. I still think some more refactoring would be a good idea here -- in particular I think most of the code in wf.rs is kind of duplicating the logic in implicator and should go, but I decided to post this PR and call it a day before diving into that. I'll write a bit more details about the solutions I adopted in the various bugs.
r? @pnkfelix (for now, anyway)
cc @aturon