When elaborating predicates, purge duplicates from the initial vector. #21968
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…move this overeager code that was pruning out ambig where-clause matches in trait selection. cc rust-lang#21974.
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…preds-in-env, r=pnkfelix We were already building a hashset to check for duplicates, but we assumed that the initial vector had no duplicates. Fixes rust-lang#21965. r? @pnkfelix
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We were already building a hashset to check for duplicates, but we assumed that the initial vector had no duplicates. Fixes #21965.
r? @pnkfelix