{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"for"}]}
    for param in &generics.own_params {
    // Here, the default `Vec<[u32]>` is not WF because `[u32]: Sized` does not hold.
        if let Some(default) = param.default_value(tcx).map(ty::EarlyBinder::instantiate_identity) {