{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"#[allow(rustc::potential_query_instability)]"}]}
            #[allow(rustc::potential_query_instability)]
            // Iteration order is irrelevant because we're collecting into an `UnordSet`.
            sess.target.implied_target_features(base_feature).into_iter().map(|f| Symbol::intern(f))