{"ast_node_type":"other","tokens":[{"end":142,"kind":"keyword","start":0,"text":"desc"}]}
        desc { |tcx| "finding the slot within the vtable of `{}` for the implementation of `{}`", key.self_ty(), key.print_only_trait_name() }
    query first_method_vtable_slot(key: ty::TraitRef<'tcx>) -> usize {
    }