{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(c) = item_segment.args().constraints.first() {
            self.lower_generic_args_of_path(span, item_def_id, parent_args, item_segment, None);
            prohibit_assoc_item_constraint(self, c, Some((item_def_id, item_segment, span)));