{"ast_node_type":"function","tokens":[{"end":38,"kind":"keyword","start":0,"text":"fn"}]}
        fn reveal_and_alloc<'a, 'tcx>(
    ) -> impl Iterator<Item = (RevealedTy<'tcx>, PrivateUninhabitedField)> + ExactSizeIterator {
            cx: &'a RustcPatCtxt<'_, 'tcx>,