De-@ ty::TypeParameterDef's bounds field
#13838
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arcnmx
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Jan 9, 2023
…undvars, r=lowr fix: handle lifetime variables in `CallableSig` query Fixes rust-lang#13838 The problem is similar to rust-lang#13223: we've been skipping non-empty binders, letting lifetime bound variables escape. I ended up refactoring `hir_ty::callable_sig_from_fnonce()`. Like rust-lang#13223, I chose to make use of `InferenceTable` which is capable of handling variables (I feel we should always use it when we solve trait-related stuff instead of manually building obligations/queries). I couldn't make up a test that crashes without this patch (since the function I'm fixing is only used *outside* `hir-ty`, simple `hir-ty` test wouldn't cause crash), but at least I tested with my local build and made sure it doesn't crash with the code in the original issue. I'd appreciate any help to find a regression test.
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cc #13231