TODO => FIXME

compiler/rustc_trait_selection/src/traits/wf.rs

@@ -300,7 +300,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
             let mut cause = cause.clone();
             if let Some(parent_trait_ref) = obligation.predicate.to_opt_poly_trait_pred() {
                 let derived_cause = traits::DerivedObligationCause {
-                    // TODO: sus
+                    // FIXME(fee1-dead): when improving error messages, change this to PolyTraitPredicate
                     parent_trait_ref: parent_trait_ref.map_bound(|t| t.trait_ref),
                     parent_code: Lrc::new(obligation.cause.code.clone()),
                 };