{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"//"}]}
    // We check this against `unstable_target_features` as that is conveniently already
    let abi_feature_constraints = sess.target.abi_required_features();
    // back-translated to rustc feature names, taking into account `-Ctarget-cpu` and `-Ctarget-feature`.