{"ast_node_type":"import","tokens":[{"end":67,"kind":"keyword","start":0,"text":"//"}]}
    // N.B., use `super_fold_with` here. If we used `fold_with`, it
fn erase_regions_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
    // could invoke the `erase_regions_ty` query recursively.