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use generic arguments of associated item in trait_ref method

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b-naber 2020-11-30 09:27:23 +01:00
parent da2cf9b9d1
commit 6a68966663
1 changed files with 9 additions and 1 deletions
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10
compiler/rustc_middle/src/ty/sty.rs
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@ -1132,8 +1132,16 @@ impl<'tcx> ProjectionTy<'tcx> {
/// For example, if this is a projection of `<T as Iterator>::Item`,
/// then this function would return a `T: Iterator` trait reference.
pub fn trait_ref(&self, tcx: TyCtxt<'tcx>) -> ty::TraitRef<'tcx> {
// FIXME: This method probably shouldn't exist at all, since it's not
// clear what this method really intends to do. Be careful when
// using this method since the resulting TraitRef additionally
// contains the substs for the assoc_item, which strictly speaking
// is not correct
let def_id = tcx.associated_item(self.item_def_id).container.id();
ty::TraitRef { def_id, substs: self.substs.truncate_to(tcx, tcx.generics_of(def_id)) }
// Include substitutions for generic arguments of associated types
let assoc_item = tcx.associated_item(self.item_def_id);
let substs_assoc_item = self.substs.truncate_to(tcx, tcx.generics_of(assoc_item.def_id));
ty::TraitRef { def_id, substs: substs_assoc_item }
}
pub fn self_ty(&self) -> Ty<'tcx> {