Error on nested impl Trait and path projections from impl Trait #48084
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cramertj
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☔ The latest upstream changes (presumably #47843) made this pull request unmergeable. Please resolve the merge conflicts. |
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Feb 13, 2018
| for type_binding in ¶ms.bindings { | ||
| // Type bindings such as `Item=impl Debug` in `Iterator<Item=Debug>` | ||
| // are allowed to contain nested `impl Trait`. | ||
| self.with_impl_trait(None, |this| visit::walk_ty(this, &type_binding.ty)); |
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I think this code would permit this
<dyn Iterator<Item = impl Debug> as Iterator>::Item
which ought not to be allowed
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Oh, probably not, because that is handled by a totally distinct visitor, I see
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Can you add a test for it, anyway?
| struct_span_err!(self.session, t.span, E0666, | ||
| "nested `impl Trait` is not allowed") | ||
| .span_label(outer_impl_trait, "outer `impl Trait`") | ||
| .span_label(t.span, "devilishly nested `impl Trait` here") |
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I don't "devilishly" should be in our error message
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No love for the E0666 easter egg 😢
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Travis is unhappy: https://travis-ci.org/rust-lang/rust/builds/341238329#L1665-L1686 The |
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Feb 14, 2018
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r=me once travis is happy |
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@bors r=nikomatsakis |
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📌 Commit 9e9c55f has been approved by |
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…atsakis Error on nested impl Trait and path projections from impl Trait cc rust-lang#34511 r? @nikomatsakis
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…atsakis Fixes rust-lang#47311. r? @nrc
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…atsakis Error on nested impl Trait and path projections from impl Trait cc rust-lang#34511 r? @nikomatsakis
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…atsakis Error on nested impl Trait and path projections from impl Trait cc rust-lang#34511 r? @nikomatsakis
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cc #34511
r? @nikomatsakis