java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf -i ../../../trunk/examples/programs/abstractInterpretation/unclassified/CallNTimes_incorrect.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-b8c145f [2019-08-05 12:19:50,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-05 12:19:50,153 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-05 12:19:50,169 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-05 12:19:50,170 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-05 12:19:50,171 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-05 12:19:50,173 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-05 12:19:50,175 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-05 12:19:50,178 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-05 12:19:50,179 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-05 12:19:50,186 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-05 12:19:50,187 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-05 12:19:50,188 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-05 12:19:50,189 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-05 12:19:50,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-05 12:19:50,193 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-05 12:19:50,194 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-05 12:19:50,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-05 12:19:50,199 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-05 12:19:50,202 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-05 12:19:50,206 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-05 12:19:50,207 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-05 12:19:50,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-05 12:19:50,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-05 12:19:50,212 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-08-05 12:19:50,213 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-08-05 12:19:50,213 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-08-05 12:19:50,214 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-08-05 12:19:50,214 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-08-05 12:19:50,215 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-08-05 12:19:50,215 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-05 12:19:50,219 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-05 12:19:50,221 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-05 12:19:50,222 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-05 12:19:50,223 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-05 12:19:50,223 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-05 12:19:50,224 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-05 12:19:50,224 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-05 12:19:50,224 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-05 12:19:50,225 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-05 12:19:50,226 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-05 12:19:50,228 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-08-05 12:19:50,250 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-05 12:19:50,251 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-05 12:19:50,252 INFO L136 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-08-05 12:19:50,252 INFO L138 SettingsManager]: * Show backtranslation warnings=false [2019-08-05 12:19:50,252 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-08-05 12:19:50,252 INFO L138 SettingsManager]: * User list type=DISABLED [2019-08-05 12:19:50,252 INFO L138 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-08-05 12:19:50,253 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-08-05 12:19:50,253 INFO L138 SettingsManager]: * Explicit value domain=true [2019-08-05 12:19:50,253 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-08-05 12:19:50,260 INFO L138 SettingsManager]: * Octagon Domain=false [2019-08-05 12:19:50,261 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-08-05 12:19:50,261 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-08-05 12:19:50,261 INFO L138 SettingsManager]: * Interval Domain=false [2019-08-05 12:19:50,262 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-05 12:19:50,262 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-05 12:19:50,263 INFO L138 SettingsManager]: * Use SBE=true [2019-08-05 12:19:50,264 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-05 12:19:50,264 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-05 12:19:50,264 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-05 12:19:50,264 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-05 12:19:50,264 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-05 12:19:50,265 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-05 12:19:50,265 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-05 12:19:50,265 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-05 12:19:50,265 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-05 12:19:50,266 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-05 12:19:50,266 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-05 12:19:50,266 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-05 12:19:50,266 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-05 12:19:50,267 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-05 12:19:50,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-05 12:19:50,270 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-05 12:19:50,270 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-05 12:19:50,271 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-05 12:19:50,271 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-08-05 12:19:50,271 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-05 12:19:50,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-05 12:19:50,271 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-05 12:19:50,272 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-08-05 12:19:50,315 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-05 12:19:50,332 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-05 12:19:50,337 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-05 12:19:50,339 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-08-05 12:19:50,339 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2019-08-05 12:19:50,340 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/abstractInterpretation/unclassified/CallNTimes_incorrect.bpl [2019-08-05 12:19:50,340 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/abstractInterpretation/unclassified/CallNTimes_incorrect.bpl' [2019-08-05 12:19:50,376 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-05 12:19:50,377 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-05 12:19:50,379 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-08-05 12:19:50,379 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-08-05 12:19:50,379 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-08-05 12:19:50,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,407 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,415 WARN L165 Inliner]: Program contained no entry procedure! [2019-08-05 12:19:50,415 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-08-05 12:19:50,415 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-08-05 12:19:50,417 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-08-05 12:19:50,418 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-05 12:19:50,418 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-05 12:19:50,418 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-05 12:19:50,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,430 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,431 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,440 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,443 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-05 12:19:50,444 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-05 12:19:50,444 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-05 12:19:50,444 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-05 12:19:50,446 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 12:19:50" (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 [2019-08-05 12:19:50,523 INFO L124 BoogieDeclarations]: Specification and implementation of procedure nRec given in one single declaration [2019-08-05 12:19:50,523 INFO L130 BoogieDeclarations]: Found specification of procedure nRec [2019-08-05 12:19:50,523 INFO L138 BoogieDeclarations]: Found implementation of procedure nRec [2019-08-05 12:19:50,524 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2019-08-05 12:19:50,524 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-05 12:19:50,524 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-05 12:19:50,762 INFO L275 CfgBuilder]: Using library mode [2019-08-05 12:19:50,762 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-08-05 12:19:50,763 INFO L202 PluginConnector]: Adding new model CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.08 12:19:50 BoogieIcfgContainer [2019-08-05 12:19:50,763 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-05 12:19:50,764 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-08-05 12:19:50,764 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-08-05 12:19:50,764 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-08-05 12:19:50,765 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "CallNTimes_incorrect.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.08 12:19:50" (1/1) ... [2019-08-05 12:19:50,790 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-08-05 12:19:51,128 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-08-05 12:19:51,153 INFO L272 AbstractInterpreter]: Visited 16 different actions 176 times. Merged at 10 different actions 62 times. Widened at 1 different actions 1 times. Performed 444 root evaluator evaluations with a maximum evaluation depth of 3. Performed 444 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 16 fixpoints after 6 different actions. Largest state had 3 variables. [2019-08-05 12:19:51,153 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-08-05 12:19:51,156 INFO L168 Benchmark]: Toolchain (without parser) took 777.84 ms. Allocated memory is still 140.0 MB. Free memory was 104.8 MB in the beginning and 76.4 MB in the end (delta: 28.4 MB). Peak memory consumption was 28.4 MB. Max. memory is 7.1 GB. [2019-08-05 12:19:51,157 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.18 ms. Allocated memory is still 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-08-05 12:19:51,158 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.13 ms. Allocated memory is still 140.0 MB. Free memory was 104.8 MB in the beginning and 102.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-08-05 12:19:51,160 INFO L168 Benchmark]: Boogie Preprocessor took 25.55 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 101.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2019-08-05 12:19:51,161 INFO L168 Benchmark]: RCFGBuilder took 319.41 ms. Allocated memory is still 140.0 MB. Free memory was 101.4 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2019-08-05 12:19:51,162 INFO L168 Benchmark]: Abstract Interpretation took 389.40 ms. Allocated memory is still 140.0 MB. Free memory was 92.0 MB in the beginning and 76.4 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. [2019-08-05 12:19:51,170 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.18 ms. Allocated memory is still 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 39.13 ms. Allocated memory is still 140.0 MB. Free memory was 104.8 MB in the beginning and 102.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.55 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 101.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 319.41 ms. Allocated memory is still 140.0 MB. Free memory was 101.4 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 389.40 ms. Allocated memory is still 140.0 MB. Free memory was 92.0 MB in the beginning and 76.4 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 20]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L12] y := 1; [L13] x := 0; [L14] COND TRUE y < 10 [L16] CALL call x := nRec(x, y); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND TRUE i == 0 [L28] res := a; [L32] RET call res := nRec(a + 1, i - 1); [L16] RET call x := nRec(x, y); [L17] y := y + 1; [L14] COND TRUE y < 10 [L16] CALL call x := nRec(x, y); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND TRUE i == 0 [L28] res := a; [L32] RET call res := nRec(a + 1, i - 1); [L32] RET call res := nRec(a + 1, i - 1); [L16] RET call x := nRec(x, y); [L17] y := y + 1; [L14] COND FALSE !(y < 10) [L20] assert y == 10; - UnprovableResult [Line: 21]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L12] y := 1; [L13] x := 0; [L14] COND TRUE y < 10 [L16] CALL call x := nRec(x, y); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND TRUE i == 0 [L28] res := a; [L32] RET call res := nRec(a + 1, i - 1); [L16] RET call x := nRec(x, y); [L17] y := y + 1; [L14] COND TRUE y < 10 [L16] CALL call x := nRec(x, y); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND FALSE !(i == 0) [L32] CALL call res := nRec(a + 1, i - 1); [L26] COND TRUE i == 0 [L28] res := a; [L32] RET call res := nRec(a + 1, i - 1); [L32] RET call res := nRec(a + 1, i - 1); [L16] RET call x := nRec(x, y); [L17] y := y + 1; [L14] COND FALSE !(y < 10) [L20] assert y == 10; [L21] assert x < 10; RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...