fn fulfillment_error_for_stalled<'tcx>(
infcx: &InferCtxt<'tcx>,
root_obligation: PredicateObligation<'tcx>,
) -> FulfillmentError<'tcx>
fn fulfillment_error_for_stalled<'tcx>(
infcx: &InferCtxt<'tcx>,
root_obligation: PredicateObligation<'tcx>,
) -> FulfillmentError<'tcx>