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Introduce subst_iter and subst_iter_copied on EarlyBinder

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This commit is contained in:
Michael Goulet 2022-10-16 18:48:28 +00:00
parent 46cf1ea1ce
commit 2ed404937f
1 changed files with 5 additions and 11 deletions
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16
clippy_utils/src/ty.rs
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@ -657,21 +657,18 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
let mut output = None;
let lang_items = cx.tcx.lang_items();
for pred in cx
for (pred, _) in cx
.tcx
.bound_explicit_item_bounds(ty.item_def_id)
.transpose_iter()
.map(|x| x.map_bound(|(p, _)| p))
.subst_iter_copied(cx.tcx, ty.substs)
{
match pred.0.kind().skip_binder() {
match pred.kind().skip_binder() {
PredicateKind::Trait(p)
if (lang_items.fn_trait() == Some(p.def_id())
|| lang_items.fn_mut_trait() == Some(p.def_id())
|| lang_items.fn_once_trait() == Some(p.def_id())) =>
{
let i = pred
.map_bound(|pred| pred.kind().rebind(p.trait_ref.substs.type_at(1)))
.subst(cx.tcx, ty.substs);
let i = pred.kind().rebind(p.trait_ref.substs.type_at(1));
if inputs.map_or(false, |inputs| inputs != i) {
// Multiple different fn trait impls. Is this even allowed?
@ -684,10 +681,7 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
// Multiple different fn trait impls. Is this even allowed?
return None;
}
output = Some(
pred.map_bound(|pred| pred.kind().rebind(p.term.ty().unwrap()))
.subst(cx.tcx, ty.substs),
);
output = pred.kind().rebind(p.term.ty()).transpose();
},
_ => (),
}