don't display duplicate trait errors#28645
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alexcrichton merged 2 commits intorust-lang:masterfrom Sep 28, 2015
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☔ The latest upstream changes (presumably #28608) made this pull request unmergeable. Please resolve the merge conflicts. |
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☔ The latest upstream changes (presumably #28629) made this pull request unmergeable. Please resolve the merge conflicts. |
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September 26, 2015 21:13
Because of type inference, duplicate obligations exist and cause duplicate errors. To avoid this, only display the first error for each (predicate,span). The inclusion of the span is somewhat bikesheddy, but *is* the more conservative option (it does not remove some instability, as duplicate obligations are ignored by `duplicate_set` under some inference conditions). Fixes rust-lang#28098 cc rust-lang#21528 (is it a dupe?)
different supertraits can suffer from the same object-safety violation, leading to duplication in the error message. Avoid it. Fixes rust-lang#20692
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more info in the individual commits
r? @nikomatsakis