{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
    let impl2_def_id = impl2_node.def_id();
    let (impl1_args, impl2_args) = get_impl_args(tcx, impl1_def_id, impl2_node)?;
    debug!(?impl2_def_id, ?impl2_args);