{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"ObligationCauseCode::HostEffectInExpr(callee_did,"}]}
                        ObligationCauseCode::HostEffectInExpr(callee_did, pred_span, hir_id, idx)
                    if let Some(hir_id) = call_hir_id {
                    } else {