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Add explanation for skip_binder in relate

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This commit is contained in:
Jack Huey 2020-12-14 12:47:11 -05:00
parent ed80815bf2
commit 01c2520081
1 changed files with 1 additions and 0 deletions
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compiler/rustc_middle/src/ty/relate.rs
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@ -616,6 +616,7 @@ impl<'tcx> Relate<'tcx> for &'tcx ty::List<ty::Binder<ty::ExistentialPredicate<'
// in `a`.
let mut a_v: Vec<_> = a.into_iter().collect();
let mut b_v: Vec<_> = b.into_iter().collect();
// `skip_binder` here is okay because `stable_cmp` doesn't look at binders
a_v.sort_by(|a, b| a.skip_binder().stable_cmp(tcx, &b.skip_binder()));
a_v.dedup();
b_v.sort_by(|a, b| a.skip_binder().stable_cmp(tcx, &b.skip_binder()));