Final bits

compiler/rustc_infer/src/infer/mod.rs

@@ -433,6 +433,7 @@ impl<'tcx> SubregionOrigin<'tcx> {
     pub fn to_constraint_category(&self) -> ConstraintCategory<'tcx> {
         match self {
             Self::Subtype(type_trace) => type_trace.cause.to_constraint_category(),
+            Self::AscribeUserTypeProvePredicate(span) => ConstraintCategory::Predicate(*span),
             _ => ConstraintCategory::BoringNoLocation,
         }
     }