{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"self.arena.alloc_from_iter(self.lower_generic_params_mut(params,"}]}
        self.arena.alloc_from_iter(self.lower_generic_params_mut(params, source))
    ) -> &'hir [hir::GenericParam<'hir>] {
    }