Dont bail in error predicate unless self ty is error in new solver#146602
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compiler-errors wants to merge 1 commit intorust-lang:mainfrom
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Dont bail in error predicate unless self ty is error in new solver#146602compiler-errors wants to merge 1 commit intorust-lang:mainfrom
compiler-errors wants to merge 1 commit intorust-lang:mainfrom
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r? @nnethercote rustbot has assigned @nnethercote. Use |
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r? lcnr |
compiler-errors
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Sep 15, 2025
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| // If either of the tupled capture types are constrained to error | ||
| // (e.g. during typeck when the infcx is tainted), then just return | ||
| // the error type directly. | ||
| if let ty::Error(_) = tupled_inputs_ty.kind() { | ||
| return tupled_inputs_ty; | ||
| } else if let ty::Error(_) = coroutine_captures_by_ref_ty.kind() { | ||
| return coroutine_captures_by_ref_ty; | ||
| } |
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This is necessary b/c we now try to project some <{async closure} as FnOnce>::Output predicate whose substs have been constrained to {type error} (namely, the tupled upvars and coroutine captures by ref tys), whereas we used to bail.
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Sep 17, 2025
| let result = if let Err(guar) = goal.predicate.error_reported() { | ||
| G::consider_error_guaranteed_candidate(self, guar) | ||
| let result = if let ty::Error(guar) = goal.predicate.self_ty().kind() { | ||
| G::consider_error_guaranteed_candidate(self, goal, guar) |
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I think we should move this out of assemble_builtin_impl_candidate to avoid ambiguity between e.g. blanket impls and the builtin impl candidate 🤔
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@compiler-errors Would you mind if I finish this? |
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go ahead |
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This should improve inference w/ predicates containing error in the new solver.
cc @ChayimFriedman2 https://rust-lang.zulipchat.com/#narrow/channel/144729-t-types/topic/How.20senstivie.20is.20the.20solver.20to.20error.20types.3F/with/539434766