bjoernager/rust
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Introduce EarlyBinder

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This commit is contained in:
Jack Huey 2022-05-08 01:17:58 -04:00
parent ecd44958e0
commit 319575ae8c
66 changed files with 339 additions and 234 deletions
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12
compiler/rustc_trait_selection/src/traits/project.rs
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@ -31,7 +31,7 @@ use rustc_infer::infer::resolve::OpportunisticRegionResolver;
use rustc_middle::traits::select::OverflowError;
use rustc_middle::ty::fold::{MaxUniverse, TypeFoldable, TypeFolder};
use rustc_middle::ty::subst::Subst;
use rustc_middle::ty::{self, Term, ToPredicate, Ty, TyCtxt};
use rustc_middle::ty::{self, EarlyBinder, Term, ToPredicate, Ty, TyCtxt};
use rustc_span::symbol::sym;
use std::collections::BTreeMap;
@ -516,7 +516,7 @@ impl<'a, 'b, 'tcx> TypeFolder<'tcx> for AssocTypeNormalizer<'a, 'b, 'tcx> {
let substs = substs.super_fold_with(self);
let generic_ty = self.tcx().type_of(def_id);
let concrete_ty = generic_ty.subst(self.tcx(), substs);
let concrete_ty = EarlyBinder(generic_ty).subst(self.tcx(), substs);
self.depth += 1;
let folded_ty = self.fold_ty(concrete_ty);
self.depth -= 1;
@ -1276,8 +1276,10 @@ fn assemble_candidates_from_trait_def<'cx, 'tcx>(
// Check whether the self-type is itself a projection.
// If so, extract what we know from the trait and try to come up with a good answer.
let bounds = match *obligation.predicate.self_ty().kind() {
ty::Projection(ref data) => tcx.item_bounds(data.item_def_id).subst(tcx, data.substs),
ty::Opaque(def_id, substs) => tcx.item_bounds(def_id).subst(tcx, substs),
ty::Projection(ref data) => {
EarlyBinder(tcx.item_bounds(data.item_def_id)).subst(tcx, data.substs)
}
ty::Opaque(def_id, substs) => EarlyBinder(tcx.item_bounds(def_id)).subst(tcx, substs),
ty::Infer(ty::TyVar(_)) => {
// If the self-type is an inference variable, then it MAY wind up
// being a projected type, so induce an ambiguity.
@ -2032,7 +2034,7 @@ fn confirm_impl_candidate<'cx, 'tcx>(
Progress { term: err.into(), obligations: nested }
} else {
assoc_ty_own_obligations(selcx, obligation, &mut nested);
Progress { term: term.subst(tcx, substs), obligations: nested }
Progress { term: EarlyBinder(term).subst(tcx, substs), obligations: nested }
}
}