Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo", uses=false) Using package ModelicaServices with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo) Using package Complex with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo) Using package Buildings with version 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo) Running command: translateModel(Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet") translateModel(Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.495/1.495, allocations: 252 MB / 267.6 MB, free: 10.92 MB / 218.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001012/0.001012, allocations: 182.8 kB / 327.3 MB, free: 2.207 MB / 250.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.959/1.959, allocations: 205.4 MB / 0.5783 GB, free: 20.22 MB / 426.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.001041/0.001041, allocations: 81.86 kB / 0.6829 GB, free: 12.87 MB / 0.5105 GB Notification: Performance of FrontEnd - loaded program: time 0.0003755/0.0003756, allocations: 8.656 kB / 0.797 GB, free: 135 MB / 0.6042 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2397/0.2401, allocations: 106.3 MB / 0.9008 GB, free: 63.88 MB / 0.6042 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet): time 0.04179/0.2819, allocations: 57.44 MB / 0.9569 GB, free: 6.266 MB / 0.6042 GB Notification: Performance of NFInst.instExpressions: time 0.01532/0.2973, allocations: 10.65 MB / 0.9673 GB, free: 11.59 MB / 0.6198 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002382/0.2998, allocations: 75.44 kB / 0.9674 GB, free: 11.52 MB / 0.6198 GB Notification: Performance of NFTyping.typeComponents: time 0.00183/0.3016, allocations: 0.5589 MB / 0.9679 GB, free: 10.95 MB / 0.6198 GB Notification: Performance of NFTyping.typeBindings: time 0.004523/0.3061, allocations: 1.623 MB / 0.9695 GB, free: 9.324 MB / 0.6198 GB Notification: Performance of NFTyping.typeClassSections: time 0.004927/0.3111, allocations: 1.52 MB / 0.971 GB, free: 7.805 MB / 0.6198 GB Notification: Performance of NFFlatten.flatten: time 0.005985/0.3171, allocations: 4.501 MB / 0.9754 GB, free: 3.293 MB / 0.6198 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001552/0.3186, allocations: 0.9684 MB / 0.9764 GB, free: 2.297 MB / 0.6198 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003505/0.3222, allocations: 1.559 MB / 0.9779 GB, free: 0.7305 MB / 0.6198 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001693/0.3239, allocations: 1.147 MB / 0.979 GB, free: 15.58 MB / 0.6355 GB Notification: Performance of NFPackage.collectConstants: time 0.0001494/0.324, allocations: 60 kB / 0.9791 GB, free: 15.52 MB / 0.6355 GB Notification: Performance of NFFlatten.collectFunctions: time 0.00297/0.327, allocations: 1.119 MB / 0.9802 GB, free: 14.4 MB / 0.6355 GB Notification: Performance of NFScalarize.scalarize: time 0.000328/0.3273, allocations: 290.6 kB / 0.9804 GB, free: 14.11 MB / 0.6355 GB Notification: Performance of NFVerifyModel.verify: time 0.0005524/0.3279, allocations: 360.8 kB / 0.9808 GB, free: 13.75 MB / 0.6355 GB Notification: Performance of NFConvertDAE.convert: time 0.002094/0.33, allocations: 1.762 MB / 0.9825 GB, free: 11.99 MB / 0.6355 GB Notification: Performance of FrontEnd - DAE generated: time 8.106e-06/0.33, allocations: 4 kB / 0.9825 GB, free: 11.98 MB / 0.6355 GB Notification: Performance of FrontEnd: time 1.983e-06/0.33, allocations: 3.938 kB / 0.9825 GB, free: 11.98 MB / 0.6355 GB Notification: Performance of Transformations before backend: time 1.746e-05/0.3301, allocations: 0 / 0.9825 GB, free: 11.98 MB / 0.6355 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 260 * Number of variables: 260 Notification: Performance of Generate backend data structure: time 0.003253/0.3333, allocations: 1.902 MB / 0.9844 GB, free: 10 MB / 0.6355 GB Notification: Performance of prepare preOptimizeDAE: time 5.588e-05/0.3334, allocations: 11.97 kB / 0.9844 GB, free: 9.988 MB / 0.6355 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003317/0.3367, allocations: 0.6456 MB / 0.985 GB, free: 9.34 MB / 0.6355 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002134/0.3389, allocations: 1.181 MB / 0.9862 GB, free: 8.109 MB / 0.6355 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 9.146e-05/0.339, allocations: 81.95 kB / 0.9862 GB, free: 8.027 MB / 0.6355 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000198/0.3392, allocations: 104 kB / 0.9863 GB, free: 7.926 MB / 0.6355 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003016/0.3422, allocations: 1.347 MB / 0.9876 GB, free: 6.512 MB / 0.6355 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.583e-05/0.3422, allocations: 3.938 kB / 0.9877 GB, free: 6.508 MB / 0.6355 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001108/0.3424, allocations: 44 kB / 0.9877 GB, free: 6.465 MB / 0.6355 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.346e-05/0.3424, allocations: 27.98 kB / 0.9877 GB, free: 6.438 MB / 0.6355 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003419/0.3458, allocations: 1.257 MB / 0.9889 GB, free: 5.18 MB / 0.6355 GB Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts. Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.008436/0.3543, allocations: 6.405 MB / 0.9952 GB, free: 14.26 MB / 0.6511 GB Notification: Performance of preOpt comSubExp (simulation): time 0.003089/0.3574, allocations: 1.242 MB / 0.9964 GB, free: 13 MB / 0.6511 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001568/0.359, allocations: 0.6747 MB / 0.9971 GB, free: 12.33 MB / 0.6511 GB Notification: Performance of preOpt evalFunc (simulation): time 0.002/0.361, allocations: 2.26 MB / 0.9993 GB, free: 9.57 MB / 0.6511 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001821/0.3628, allocations: 0.8289 MB / 1 GB, free: 8.711 MB / 0.6511 GB Notification: Performance of pre-optimization done (n=100): time 3.587e-06/0.3628, allocations: 0 / 1 GB, free: 8.711 MB / 0.6511 GB Notification: Performance of matching and sorting (n=100): time 0.005454/0.3683, allocations: 2.174 MB / 1.002 GB, free: 6.512 MB / 0.6511 GB Notification: Performance of inlineWhenForInitialization (initialization): time 9.792e-05/0.3684, allocations: 153.5 kB / 1.002 GB, free: 6.332 MB / 0.6511 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001662/0.3701, allocations: 1.214 MB / 1.004 GB, free: 5.109 MB / 0.6511 GB Notification: Performance of collectPreVariables (initialization): time 8.781e-05/0.3702, allocations: 45.7 kB / 1.004 GB, free: 5.059 MB / 0.6511 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006053/0.3708, allocations: 0.6939 MB / 1.004 GB, free: 4.355 MB / 0.6511 GB Notification: Performance of collectInitialBindings (initialization): time 0.0003169/0.3711, allocations: 331.2 kB / 1.005 GB, free: 4.027 MB / 0.6511 GB Notification: Performance of simplifyInitialFunctions (initialization): time 5.746e-05/0.3712, allocations: 16 kB / 1.005 GB, free: 4.012 MB / 0.6511 GB Notification: Performance of setup shared object (initialization): time 0.0001574/0.3713, allocations: 345.9 kB / 1.005 GB, free: 3.668 MB / 0.6511 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001509/0.3728, allocations: 0.5679 MB / 1.005 GB, free: 3.098 MB / 0.6511 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001641/0.3745, allocations: 0.7726 MB / 1.006 GB, free: 2.25 MB / 0.6511 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001609/0.3761, allocations: 0.6834 MB / 1.007 GB, free: 1.551 MB / 0.6511 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.511e-06/0.3761, allocations: 3.984 kB / 1.007 GB, free: 1.547 MB / 0.6511 GB Notification: Performance of matching and sorting (n=126) (initialization): time 0.003958/0.3801, allocations: 1.734 MB / 1.009 GB, free: 15.78 MB / 0.6667 GB Notification: Performance of prepare postOptimizeDAE: time 0.0002315/0.3803, allocations: 307.8 kB / 1.009 GB, free: 15.41 MB / 0.6667 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.127e-05/0.3804, allocations: 4 kB / 1.009 GB, free: 15.4 MB / 0.6667 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.23e-05/0.3804, allocations: 12 kB / 1.009 GB, free: 15.39 MB / 0.6667 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001212/0.3816, allocations: 287.5 kB / 1.009 GB, free: 15.11 MB / 0.6667 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.622e-05/0.3816, allocations: 8 kB / 1.009 GB, free: 15.1 MB / 0.6667 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001494/0.3831, allocations: 227 kB / 1.009 GB, free: 14.88 MB / 0.6667 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001132/0.3833, allocations: 51.97 kB / 1.009 GB, free: 14.83 MB / 0.6667 GB Notification: Performance of prepare postOptimizeDAE: time 6.292e-06/0.3833, allocations: 7.938 kB / 1.009 GB, free: 14.82 MB / 0.6667 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.003653/0.3869, allocations: 1.644 MB / 1.011 GB, free: 13.15 MB / 0.6667 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.234e-06/0.387, allocations: 4 kB / 1.011 GB, free: 13.15 MB / 0.6667 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.106e-05/0.387, allocations: 11.94 kB / 1.011 GB, free: 13.14 MB / 0.6667 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001181/0.3882, allocations: 284.1 kB / 1.011 GB, free: 12.86 MB / 0.6667 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.338e-05/0.3882, allocations: 8 kB / 1.011 GB, free: 12.85 MB / 0.6667 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001661/0.3898, allocations: 219.2 kB / 1.012 GB, free: 12.64 MB / 0.6667 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001128/0.39, allocations: 47.98 kB / 1.012 GB, free: 12.59 MB / 0.6667 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 18 * Number of states: 0 () * Number of discrete variables: 21 ($whenCondition1,$whenCondition2,$whenCondition3,TSetHeat.a,TSetHeat.b,TSetHeat.last,$PRE.TSetHeat.nextEvent,TSetHeat.nextEvent,TSetHeat.nextEventScaled,TSetCool.a,TSetCool.b,TSetCool.last,$PRE.TSetCool.nextEvent,TSetCool.nextEvent,TSetCool.nextEventScaled,TSetCoolHeat.a,TSetCoolHeat.b,TSetCoolHeat.last,$PRE.TSetCoolHeat.nextEvent,TSetCoolHeat.nextEvent,TSetCoolHeat.nextEventScaled) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (111): * Single equations (assignments): 108 * Array equations: 0 * Algorithm blocks: 3 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.001014/0.391, allocations: 0.5002 MB / 1.012 GB, free: 12.06 MB / 0.6667 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002522/0.3913, allocations: 162 kB / 1.012 GB, free: 11.9 MB / 0.6667 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004996/0.3963, allocations: 2.323 MB / 1.015 GB, free: 9.555 MB / 0.6667 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 3.861e-05/0.3963, allocations: 19.98 kB / 1.015 GB, free: 9.535 MB / 0.6667 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 8.646e-06/0.3963, allocations: 0 / 1.015 GB, free: 9.535 MB / 0.6667 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.245e-05/0.3963, allocations: 7.984 kB / 1.015 GB, free: 9.527 MB / 0.6667 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.006651/0.403, allocations: 3.639 MB / 1.018 GB, free: 5.797 MB / 0.6667 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 9.178e-06/0.403, allocations: 4 kB / 1.018 GB, free: 5.793 MB / 0.6667 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001146/0.4042, allocations: 231.8 kB / 1.018 GB, free: 5.566 MB / 0.6667 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.227e-05/0.4042, allocations: 8 kB / 1.018 GB, free: 5.559 MB / 0.6667 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 9.373e-05/0.4043, allocations: 51.91 kB / 1.018 GB, free: 5.508 MB / 0.6667 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 8.756e-06/0.4043, allocations: 4 kB / 1.018 GB, free: 5.504 MB / 0.6667 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.228e-06/0.4043, allocations: 4 kB / 1.018 GB, free: 5.5 MB / 0.6667 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.006294/0.4106, allocations: 3.058 MB / 1.021 GB, free: 2.387 MB / 0.6667 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0008871/0.4116, allocations: 394.6 kB / 1.022 GB, free: 1.98 MB / 0.6667 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001994/0.4118, allocations: 28 kB / 1.022 GB, free: 1.953 MB / 0.6667 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001204/0.413, allocations: 171.7 kB / 1.022 GB, free: 1.785 MB / 0.6667 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001491/0.4131, allocations: 72.91 kB / 1.022 GB, free: 1.715 MB / 0.6667 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001012/0.4132, allocations: 47.97 kB / 1.022 GB, free: 1.668 MB / 0.6667 GB Notification: Performance of sorting global known variables: time 0.001298/0.4146, allocations: 0.8226 MB / 1.023 GB, free: 0.8477 MB / 0.6667 GB Notification: Performance of sort global known variables: time 1.6e-07/0.4146, allocations: 11.94 kB / 1.023 GB, free: 0.8359 MB / 0.6667 GB Notification: Performance of remove unused functions: time 0.002266/0.4168, allocations: 0.8462 MB / 1.024 GB, free: 15.98 MB / 0.6823 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 6 * Number of states: 6 (heaHigPowOut.T,cooLimPowOut.T,heaCooUnlOut.T,heaHigPowIn.T,cooLimPowIn.T,heaCooUnlIn.T) * Number of discrete variables: 18 ($whenCondition1,$whenCondition2,$whenCondition3,TSetHeat.a,TSetHeat.b,TSetHeat.last,TSetHeat.nextEvent,TSetHeat.nextEventScaled,TSetCool.a,TSetCool.b,TSetCool.last,TSetCool.nextEvent,TSetCool.nextEventScaled,TSetCoolHeat.a,TSetCoolHeat.b,TSetCoolHeat.last,TSetCoolHeat.nextEvent,TSetCoolHeat.nextEventScaled) * Number of discrete states: 18 (TSetCoolHeat.nextEvent,TSetCoolHeat.last,TSetCoolHeat.nextEventScaled,TSetCoolHeat.b,TSetCoolHeat.a,$whenCondition3,TSetCool.nextEvent,TSetCool.last,TSetCool.nextEventScaled,TSetCool.b,TSetCool.a,$whenCondition2,TSetHeat.nextEvent,TSetHeat.last,TSetHeat.nextEventScaled,TSetHeat.b,TSetHeat.a,$whenCondition1) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (104): * Single equations (assignments): 82 * Array equations: 0 * Algorithm blocks: 3 * Record equations: 19 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.001165/0.418, allocations: 0.5632 MB / 1.024 GB, free: 15.43 MB / 0.6823 GB Notification: Performance of simCode: created initialization part: time 0.005925/0.424, allocations: 2.76 MB / 1.027 GB, free: 12.61 MB / 0.6823 GB Notification: Performance of simCode: created event and clocks part: time 3.968e-06/0.424, allocations: 0 / 1.027 GB, free: 12.61 MB / 0.6823 GB Notification: Performance of simCode: created simulation system equations: time 0.00208/0.4261, allocations: 1.098 MB / 1.028 GB, free: 11.47 MB / 0.6823 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003607/0.4297, allocations: 0.6405 MB / 1.029 GB, free: 10.84 MB / 0.6823 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.007435/0.4371, allocations: 3.801 MB / 1.032 GB, free: 6.988 MB / 0.6823 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001034/0.4382, allocations: 1.275 MB / 1.034 GB, free: 5.684 MB / 0.6823 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0006338/0.4389, allocations: 151.3 kB / 1.034 GB, free: 5.535 MB / 0.6823 GB Notification: Performance of SimCode: time 1.162e-06/0.4389, allocations: 3.938 kB / 1.034 GB, free: 5.531 MB / 0.6823 GB Notification: Performance of Templates: time 0.4697/0.9086, allocations: 27.92 MB / 1.061 GB, free: 146.2 MB / 0.698 GB make -j1 -f Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.makefile (rm -f Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.sim & ./Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.Validation.PrescribedOutlet.pipe 2>&1)