Remove duplicated errors for closure type mismatch#41760
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| .map_err(|e| OutputTypeParameterMismatch(expected_trait_ref, obligation_trait_ref, e)) | ||
| .map_err(|e| { | ||
| let self_ty = expected_trait_ref.self_ty(); | ||
| match (&self_ty.sty, &e) { |
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Can you please just compare the # of parameters in the fn sig vs. the # of parameters in the obligation (that's obligation.predicate.skip_binder().subst_at(1))?
| { | ||
| let span = obligation.cause.span; | ||
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| if !self.reported_selection_errors.borrow_mut().insert((span, error.clone())) { |
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This sounds overly excessive. Outside of closures all trait errors are Unimplemented, so you are only showing 1 error per span.
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Yeah, it was surprising to me how many tests were affected by this. I'll think of a different way to deduplicate these errors...
Originally I was trying to get to the point where only one of FnMut and FnOnce were required, which feels like the correct way to accomplish this, but could not find where to tackle that (even pouring through the code and with full debugging output on :-/ ).
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Superseded by #41840. |
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Follow up to #41488.