Fix generics ICE

compiler/rustc_hir/src/hir.rs

@@ -3953,6 +3953,7 @@ impl<'hir> Node<'hir> {
             | Node::TraitItem(TraitItem { generics, .. })
             | Node::ImplItem(ImplItem { generics, .. }) => Some(generics),
             Node::Item(item) => item.kind.generics(),
+            Node::OpaqueTy(opaq) => Some(opaq.generics),
             _ => None,
         }
     }

compiler/rustc_hir_analysis/src/collect/generics_of.rs

@@ -22,6 +22,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
     if let Some(ty::ImplTraitInTraitData::Trait { fn_def_id, opaque_def_id }) =
         tcx.opt_rpitit_info(def_id.to_def_id())
     {
+        debug!("RPITIT fn_def_id={fn_def_id:?} opaque_def_id={opaque_def_id:?}");
         let trait_def_id = tcx.parent(fn_def_id);
         let opaque_ty_generics = tcx.generics_of(opaque_def_id);
         let opaque_ty_parent_count = opaque_ty_generics.parent_count;

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -2247,7 +2247,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                     span_bug!(
                         tcx.def_span(param.def_id),
                         "only expected lifetime for opaque's own generics, got {:?}",
-                        param.kind
+                        param
                     );
                 };
                 let hir::GenericArg::Lifetime(lifetime) = &lifetimes[i] else {