1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_interface/src/util.rs b/compiler/rustc_interface/src/util.rs
index 0d1081ee26b..3921187baa5 100644
--- a/compiler/rustc_interface/src/util.rs
+++ b/compiler/rustc_interface/src/util.rs
@@ -742,6 +742,8 @@ impl<'a, 'b> ReplaceBodyWithLoop<'a, 'b> {
                                         ast::AssocConstraintKind::Equality { ref term } => {
                                             match term {
                                                 Term::Ty(ty) => involves_impl_trait(ty),
+                                                // FIXME(...): This should check if the constant
+                                                // involves a trait impl, but for now ignore.
                                                 Term::Const(_) => false,
                                             }
                                         }