https://travis-ci.org/github/bitcoin/bitcoin/jobs/680452476#L6107
case ThresholdState::ACTIVE:
            {
                
                const struct VBDeploymentInfo& vbinfo = VersionBitsDeploymentInfo[pos];
                aRules.push_back(gbt_vb_name(pos));
                if (setClientRules.find(vbinfo.name) == setClientRules.end()) {
                    
                    if (!vbinfo.gbt_force) {
                        
                        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Support for '%s' rule requires explicit client support", vbinfo.name));
                    }
                }
                break;
            }
        }
    }
    result.pushKV("version", pblock->nVersion);
    result.pushKV("rules", aRules);
    result.pushKV("vbavailable", vbavailable);
    result.pushKV("vbrequired", int(0));
    if (nMaxVersionPreVB >= 2) {
        
        
        
        
        aMutable.push_back("version/force");
    }
    result.pushKV("previousblockhash", pblock->hashPrevBlock.GetHex());
    result.pushKV("transactions", transactions);
    result.pushKV("coinbaseaux", aux);