{"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
    let span = tcx.def_span(def_id);
    let ty = tcx.type_of(def_id).instantiate_identity();
    let layout = match tcx.layout_of(ty::TypingEnv::fully_monomorphized().as_query_input(ty)) {