Make TraitEngines generic over error

compiler/rustc_trait_selection/src/traits/structural_normalize.rs

@@ -1,5 +1,5 @@
 use rustc_infer::infer::at::At;
-use rustc_infer::traits::{FulfillmentError, TraitEngine};
+use rustc_infer::traits::{FulfillmentErrorLike, TraitEngine};
 use rustc_macros::extension;
 use rustc_middle::ty::{self, Ty};
 
@@ -7,11 +7,11 @@ use crate::traits::{NormalizeExt, Obligation};
 
 #[extension(pub trait StructurallyNormalizeExt<'tcx>)]
 impl<'tcx> At<'_, 'tcx> {
-    fn structurally_normalize(
+    fn structurally_normalize<E: FulfillmentErrorLike<'tcx>>(
         &self,
         ty: Ty<'tcx>,
-        fulfill_cx: &mut dyn TraitEngine<'tcx>,
-    ) -> Result<Ty<'tcx>, Vec<FulfillmentError<'tcx>>> {
+        fulfill_cx: &mut dyn TraitEngine<'tcx, E>,
+    ) -> Result<Ty<'tcx>, Vec<E>> {
         assert!(!ty.is_ty_var(), "should have resolved vars before calling");
 
         if self.infcx.next_trait_solver() {