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add xref to rust-guide

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Niko Matsakis 2018-03-15 14:27:00 -04:00 • committed by GitHub
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4
src/librustc_traits/lowering.rs
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@ -117,6 +117,10 @@ fn program_clauses_for_impl<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId
if let ImplPolarity::Negative = tcx.impl_polarity(def_id) {
return Lrc::new(vec![]);
}
// Rule Implemented-From-Impl
//
// (see rustc guide)
let trait_ref = tcx.impl_trait_ref(def_id).unwrap();
let trait_ref = ty::TraitPredicate { trait_ref }.lower();