{"ast_node_type":"function","tokens":[{"end":79,"kind":"keyword","start":0,"text":"fn"}]}
fn lookup_stability(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<Stability> {
#[instrument(level = "debug", skip(tcx))]
    // Propagate unstability. This can happen even for non-staged-api crates in case