{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"debug!(\"find_mir_or_eval_fn:"}]}
        debug!("find_mir_or_eval_fn: {:?}", orig_instance);
    ) -> InterpResult<'tcx, Option<(&'tcx mir::Body<'tcx>, ty::Instance<'tcx>)>> {