fix

Author: asukaminato0721

src/librustdoc/clean/mod.rs

@@ -561,12 +561,7 @@ fn clean_generic_param_def(
             def.name,
             GenericParamDefKind::Const {
                 ty: Box::new(clean_middle_ty(
-                    ty::Binder::dummy(
-                        cx.tcx
-                            .type_of(def.def_id)
-                            .no_bound_vars()
-                            .expect("const parameter types cannot be generic"),
-                    ),
+                    ty::Binder::dummy(cx.tcx.type_of(def.def_id).instantiate_identity()),
                     cx,
                     Some(def.def_id),
                     None,