java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/array-examples/sanfoundry_24-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-673a906-m [2019-10-03 04:24:14,816 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-03 04:24:14,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-03 04:24:14,830 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-03 04:24:14,831 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-03 04:24:14,832 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-03 04:24:14,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-03 04:24:14,835 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-03 04:24:14,837 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-03 04:24:14,838 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-03 04:24:14,839 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-03 04:24:14,841 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-03 04:24:14,841 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-03 04:24:14,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-03 04:24:14,843 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-03 04:24:14,844 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-03 04:24:14,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-03 04:24:14,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-03 04:24:14,848 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-03 04:24:14,850 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-03 04:24:14,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-03 04:24:14,853 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-03 04:24:14,855 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-03 04:24:14,855 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-03 04:24:14,858 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-03 04:24:14,858 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-03 04:24:14,858 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-03 04:24:14,859 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-03 04:24:14,860 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-03 04:24:14,861 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-03 04:24:14,861 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-03 04:24:14,862 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-03 04:24:14,863 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-03 04:24:14,863 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-03 04:24:14,865 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-03 04:24:14,865 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-03 04:24:14,865 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-03 04:24:14,866 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-03 04:24:14,866 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-03 04:24:14,868 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-03 04:24:14,869 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-03 04:24:14,870 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-10-03 04:24:14,896 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-03 04:24:14,896 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-03 04:24:14,896 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-10-03 04:24:14,897 INFO L138 SettingsManager]: * Log level for plugins=info [2019-10-03 04:24:14,900 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-03 04:24:14,901 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-03 04:24:14,901 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-10-03 04:24:14,901 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-10-03 04:24:14,901 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-03 04:24:14,901 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-10-03 04:24:14,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-03 04:24:14,904 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-03 04:24:14,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-03 04:24:14,905 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-03 04:24:14,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-03 04:24:14,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-03 04:24:14,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-03 04:24:14,905 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-03 04:24:14,906 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-03 04:24:14,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-03 04:24:14,906 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-03 04:24:14,907 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-10-03 04:24:14,907 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-03 04:24:14,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-03 04:24:14,908 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-03 04:24:14,908 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-03 04:24:14,908 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-10-03 04:24:14,908 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-03 04:24:14,909 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-03 04:24:14,909 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-10-03 04:24:14,948 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-03 04:24:14,961 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-03 04:24:14,965 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-03 04:24:14,966 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-03 04:24:14,966 INFO L275 PluginConnector]: CDTParser initialized [2019-10-03 04:24:14,967 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sanfoundry_24-1.i [2019-10-03 04:24:15,037 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdde1129d/c6559d91ed82409b8f6fb7f806aec68c/FLAGb38668d2f [2019-10-03 04:24:15,511 INFO L306 CDTParser]: Found 1 translation units. [2019-10-03 04:24:15,512 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sanfoundry_24-1.i [2019-10-03 04:24:15,520 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdde1129d/c6559d91ed82409b8f6fb7f806aec68c/FLAGb38668d2f [2019-10-03 04:24:15,881 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bdde1129d/c6559d91ed82409b8f6fb7f806aec68c [2019-10-03 04:24:15,891 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-03 04:24:15,892 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-03 04:24:15,893 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-03 04:24:15,893 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-03 04:24:15,897 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-03 04:24:15,898 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 04:24:15" (1/1) ... [2019-10-03 04:24:15,901 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d3d1fbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:15, skipping insertion in model container [2019-10-03 04:24:15,901 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 04:24:15" (1/1) ... [2019-10-03 04:24:15,909 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-03 04:24:15,924 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-03 04:24:16,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 04:24:16,190 INFO L188 MainTranslator]: Completed pre-run [2019-10-03 04:24:16,240 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 04:24:16,366 INFO L192 MainTranslator]: Completed translation [2019-10-03 04:24:16,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16 WrapperNode [2019-10-03 04:24:16,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-03 04:24:16,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-03 04:24:16,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-03 04:24:16,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-03 04:24:16,387 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,402 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,402 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,429 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,433 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-03 04:24:16,437 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-03 04:24:16,437 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-03 04:24:16,437 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-03 04:24:16,438 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 04:24:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-03 04:24:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-03 04:24:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-03 04:24:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-03 04:24:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure printEven [2019-10-03 04:24:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure printOdd [2019-10-03 04:24:16,497 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure printEven [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure printOdd [2019-10-03 04:24:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-03 04:24:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-03 04:24:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-03 04:24:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-03 04:24:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-03 04:24:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-03 04:24:16,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-03 04:24:16,855 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-03 04:24:16,855 INFO L283 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-03 04:24:16,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 04:24:16 BoogieIcfgContainer [2019-10-03 04:24:16,857 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-03 04:24:16,857 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-10-03 04:24:16,857 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-10-03 04:24:16,858 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-10-03 04:24:16,858 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 04:24:16" (1/1) ... [2019-10-03 04:24:16,884 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-03 04:24:16,967 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-10-03 04:24:16,973 INFO L272 AbstractInterpreter]: Visited 6 different actions 6 times. Never merged. Never widened. Performed 15 root evaluator evaluations with a maximum evaluation depth of 0. Performed 15 inverse root evaluator evaluations with a maximum inverse evaluation depth of 0. Never found a fixpoint. Largest state had 26 variables. [2019-10-03 04:24:16,973 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-10-03 04:24:16,978 INFO L168 Benchmark]: Toolchain (without parser) took 1082.35 ms. Allocated memory was 138.9 MB in the beginning and 199.8 MB in the end (delta: 60.8 MB). Free memory was 84.5 MB in the beginning and 153.6 MB in the end (delta: -69.1 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-10-03 04:24:16,979 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 138.9 MB. Free memory is still 103.4 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-10-03 04:24:16,981 INFO L168 Benchmark]: CACSL2BoogieTranslator took 477.44 ms. Allocated memory was 138.9 MB in the beginning and 199.8 MB in the end (delta: 60.8 MB). Free memory was 84.5 MB in the beginning and 177.8 MB in the end (delta: -93.3 MB). Peak memory consumption was 21.0 MB. Max. memory is 7.1 GB. [2019-10-03 04:24:16,982 INFO L168 Benchmark]: Boogie Preprocessor took 65.23 ms. Allocated memory is still 199.8 MB. Free memory was 177.8 MB in the beginning and 175.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. [2019-10-03 04:24:16,985 INFO L168 Benchmark]: RCFGBuilder took 420.24 ms. Allocated memory is still 199.8 MB. Free memory was 175.6 MB in the beginning and 158.9 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. [2019-10-03 04:24:16,986 INFO L168 Benchmark]: Abstract Interpretation took 115.72 ms. Allocated memory is still 199.8 MB. Free memory was 158.9 MB in the beginning and 153.6 MB in the end (delta: 5.3 MB). Peak memory consumption was 5.3 MB. Max. memory is 7.1 GB. [2019-10-03 04:24:16,996 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 138.9 MB. Free memory is still 103.4 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 477.44 ms. Allocated memory was 138.9 MB in the beginning and 199.8 MB in the end (delta: 60.8 MB). Free memory was 84.5 MB in the beginning and 177.8 MB in the end (delta: -93.3 MB). Peak memory consumption was 21.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 65.23 ms. Allocated memory is still 199.8 MB. Free memory was 177.8 MB in the beginning and 175.6 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 420.24 ms. Allocated memory is still 199.8 MB. Free memory was 175.6 MB in the beginning and 158.9 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 115.72 ms. Allocated memory is still 199.8 MB. Free memory was 158.9 MB in the beginning and 153.6 MB in the end (delta: 5.3 MB). Peak memory consumption was 5.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location RESULT: Ultimate proved your program to be correct! Received shutdown request...