verified that skip-binder is ok

2019-06-05 15:27:19 -04:00 · 2019-06-05 15:27:19 -04:00 · a900427188
commit a900427188
parent e48dd1257c
1 changed files with 2 additions and 2 deletions
--- a/src/librustc_typeck/astconv.rs
+++ b/src/librustc_typeck/astconv.rs
@ -1149,8 +1149,8 @@ impl<'o, 'gcx: 'tcx, 'tcx> dyn AstConv<'gcx, 'tcx> + 'o {
                //
                // `<T as Iterator>::Item: Debug`
                //
-                // Calling `skip_binder` is okay, because the predicates are re-bound later by
-                // `instantiate_poly_trait_ref`.
+                // Calling `skip_binder` is okay, because `add_bounds` expects the `param_ty`
+                // parameter to have a skipped binder.
                let param_ty = tcx.mk_projection(assoc_ty.def_id, candidate.skip_binder().substs);
                self.add_bounds(
                    param_ty,