Annotate some bugs

compiler/rustc_trait_selection/src/traits/query/normalize.rs

@@ -285,7 +285,7 @@ impl<'cx, 'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for QueryNormalizer<'cx, 'tcx>
                     ty::Projection => tcx.normalize_projection_ty(c_data),
                     ty::Weak => tcx.normalize_weak_ty(c_data),
                     ty::Inherent => tcx.normalize_inherent_projection_ty(c_data),
-                    _ => unreachable!(),
+                    kind => unreachable!("did not expect {kind:?} due to match arm above"),
                 }?;
                 // We don't expect ambiguity.
                 if !result.value.is_proven() {

compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs

@@ -184,7 +184,9 @@ pub fn compute_implied_outlives_bounds_inner<'tcx>(
                 push_outlives_components(tcx, ty_a, &mut components);
                 implied_bounds.extend(implied_bounds_from_components(r_b, components))
             }
-            ty::GenericArgKind::Const(_) => unreachable!(),
+            ty::GenericArgKind::Const(_) => {
+                unreachable!("consts do not participate in outlives bounds")
+            }
         }
     }