{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
    let mut target_features = tcx.sess.unstable_target_features.clone();
fn asm_target_features(tcx: TyCtxt<'_>, did: DefId) -> &FxIndexSet<Symbol> {
    if tcx.def_kind(did).has_codegen_attrs() {