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Internal compiler error due to unexpected variable (which is not part of the program) #3593

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Internal compiler error due to unexpected variable (which is not part of the program)#3593
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P4bugtriage-doneHas been reviewed by someone on triage rotation.
@luisggpina

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@luisggpina
luisggpina
opened on May 8, 2020

Input for SIMPLE_OPTIMIZATIONS:

throw (function(u_0){ ((function(a_3){ while (u_9){ if (f_10) { break;var f_10;continue };{ throw true } } })())})

Error output:

java.lang.RuntimeException: INTERNAL COMPILER ERROR.
Please file a bug at http://go/jscompiler-bug with this stack trace, sponge link, and repro steps (a CL# and a build target).

Unexpected variable a
  Node(NAME a): input0:1:56
throw (function(u_0){ ((function(a_3){ while (u_9){ if (f_10) { break;var f_10;continue };{ throw true } } })())})
  Parent(NOT): input0:1:56
throw (function(u_0){ ((function(a_3){ while (u_9){ if (f_10) { break;var f_10;continue };{ throw true } } })())})

	at com.google.javascript.jscomp.VarCheck.handleUndeclaredVariableRef(VarCheck.java:344)
	at com.google.javascript.jscomp.VarCheck.checkName(VarCheck.java:274)
	at com.google.javascript.jscomp.VarCheck.visit(VarCheck.java:209)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:909)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:905)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:905)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:902)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:902)
	at com.google.javascript.jscomp.NodeTraversal.traverseFunction(NodeTraversal.java:948)
	at com.google.javascript.jscomp.NodeTraversal.handleFunction(NodeTraversal.java:854)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:880)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:905)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.handleScript(NodeTraversal.java:842)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:877)
	at com.google.javascript.jscomp.NodeTraversal.traverseChildren(NodeTraversal.java:1037)
	at com.google.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:905)
	at com.google.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:445)
	at com.google.javascript.jscomp.VarCheck.process(VarCheck.java:172)
	at com.google.javascript.jscomp.PhaseOptimizer$NamedPass.process(PhaseOptimizer.java:317)
	at com.google.javascript.jscomp.PhaseOptimizer.process(PhaseOptimizer.java:232)
	at com.google.javascript.jscomp.Compiler.performOptimizations(Compiler.java:2417)
	at com.google.javascript.jscomp.Compiler.lambda$stage2Passes$1(Compiler.java:802)
	at com.google.javascript.jscomp.CompilerExecutor.runInCompilerThread(CompilerExecutor.java:129)
	at com.google.javascript.jscomp.Compiler.runInCompilerThread(Compiler.java:829)
	at com.google.javascript.jscomp.Compiler.stage2Passes(Compiler.java:799)
	at com.google.javascript.jscomp.Compiler.compileModules(Compiler.java:744)
	at com.google.javascript.jscomp.debugger.CompilationServlet.service(CompilationServlet.java:99)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772)
	at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at com.google.apphosting.runtime.jetty9.ParseBlobUploadHandler.handle(ParseBlobUploadHandler.java:119)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1182)
	at com.google.apphosting.runtime.jetty9.AppEngineWebAppContext.doHandle(AppEngineWebAppContext.java:187)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:293)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.server.Server.handle(Server.java:539)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333)
	at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:213)
	at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81)
	at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134)
	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:757)
	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:720)
	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:690)
	at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:882)
	at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:270)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Unexpected variable a
	... 64 more

Reproduce URL: https://closure-compiler-debugger.appspot.com/#input0%3Dthrow%2520(function(u_0)%257B%2520((function(a_3)%257B%2520while%2520(u_9)%257B%2520if%2520(f_10)%2520%257B%2520break%253Bvar%2520f_10%253Bcontinue%2520%257D%253B%257B%2520throw%2520true%2520%257D%2520%257D%2520%257D)())%257D)%250A%26input1%26conformanceConfig%26externs%26refasterjs-template%26includeDefaultExterns%3Dtrue%26ALIAS_ALL_STRINGS%3Dtrue%26AMBIGUATE_PROPERTIES%3Dtrue%26COALESCE_VARIABLE_NAMES%3Dtrue%26COLLAPSE_VARIABLE_DECLARATIONS%3Dtrue%26COLLAPSE_ANONYMOUS_FUNCTIONS%3Dtrue%26COLLAPSE_PROPERTIES%3Dtrue%26COLLAPSE_OBJECT_LITERALS%3Dtrue%26COMPUTE_FUNCTION_SIDE_EFFECTS%3Dtrue%26CONVERT_TO_DOTTED_PROPERTIES%3Dtrue%26CROSS_CHUNK_CODE_MOTION%3Dtrue%26CROSS_CHUNK_METHOD_MOTION%3Dtrue%26DEAD_ASSIGNMENT_ELIMINATION%3Dtrue%26DISAMBIGUATE_PROPERTIES%3Dtrue%26EXTRACT_PROTOTYPE_MEMBER_DECLARATIONS%3Dtrue%26FOLD_CONSTANTS%3Dtrue%26INLINE_CONSTANTS%3Dtrue%26INLINE_FUNCTIONS%3Dtrue%26INLINE_PROPERTIES%3Dtrue%26INLINE_VARIABLES%3Dtrue%26LABEL_RENAMING%3Dtrue%26OPTIMIZE_CALLS%3Dtrue%26REMOVE_ABSTRACT_METHODS%3Dtrue%26REMOVE_DEAD_CODE%3Dtrue%26REMOVE_UNUSED_CLASS_PROPERTIES%3Dtrue%26REMOVE_UNUSED_PROTOTYPE_PROPERTIES%3Dtrue%26REMOVE_UNUSED_PROTOTYPE_PROPERTIES_IN_EXTERNS%3Dtrue%26REMOVE_UNUSED_VARIABLES%3Dtrue%26REWRITE_FUNCTION_EXPRESSIONS%3Dtrue%26SMART_NAME_REMOVAL%3Dtrue%26USE_TYPES_FOR_LOCAL_OPTIMIZATION%3Dtrue%26VARIABLE_RENAMING%3Dtrue%26PROPERTY_RENAMING%3Dtrue%26MOVE_FUNCTION_DECLARATIONS%3Dtrue%26SYNTHETIC_BLOCK_MARKER%3Dtrue%26CHROME_PASS%3Dtrue%26PRESERVE_TYPE_ANNOTATIONS%3Dtrue

Compiler Options (default options)

aggressiveFusion=false
 aliasableStrings=[]
 aliasAllStrings=false
 aliasHandler=com.google.javascript.jscomp.CompilerOptions$NullAliasTransformationHandler@5bb21b69
 aliasStringsBlacklist=
 allowHotswapReplaceScript=false
 ambiguateProperties=false
 angularPass=false
 anonymousFunctionNaming=OFF
 assumeClosuresOnlyCaptureReferences=false
 assumeGettersArePure=true
 assumeStrictThis=false
 browserResolverPrefixReplacements={}
 brokenClosureRequiresLevel=ERROR
 checkDeterminism=false
 checkGlobalNamesLevel=OFF
 checkGlobalThisLevel=OFF
 checkMissingGetCssNameLevel=OFF
 checksOnly=false
 checkSuspiciousCode=false
 checkSymbols=false
 checkTypes=false
 closurePass=true
 coalesceVariableNames=true
 collapseAnonymousFunctions=false
 collapseObjectLiterals=true
 collapseProperties=NONE
 collapseVariableDeclarations=true
 colorizeErrorOutput=false
 computeFunctionSideEffects=false
 conformanceConfigs=[]
 conformanceRemoveRegexFromPath=Optional.of(^((.*/)?google3/)?((^/)?(blaze|bazel)-out/[^/]+/bin/)?)
 continueAfterErrors=false
 convertToDottedProperties=true
 crossChunkCodeMotion=false
 crossChunkCodeMotionNoStubMethods=false
 crossChunkMethodMotion=false
 dartPass=false
 deadAssignmentElimination=true
 declaredGlobalExternsOnWindow=true
 defineReplacements={}
 dependencyOptions=DependencyOptions{mode=SORT_ONLY
 entryPoints=[]}
 devirtualizeMethods=false
 devMode=OFF
 disambiguatePrivateProperties=false
 disambiguateProperties=false
 enableModuleRewriting=true
 enforceAccessControlCodingConventions=false
 environment=BROWSER
 errorFormat=SINGLELINE
 es6ModuleTranspilation=COMPILE
 exportLocalPropertyDefinitions=false
 exportTestFunctions=false
 externExports=false
 extractPrototypeMemberDeclarations=OFF
 extraSmartNameRemoval=false
 filesToPrintAfterEachPassRegexList=[]
 flowSensitiveInlineVariables=false
 foldConstants=true
 forceLibraryInjection=[]
 gatherCssNames=false
 generateExports=false
 generatePseudoNames=false
 generateTypedExterns=false
 idGenerators={}
 incrementalCheckMode=OFF
 inferConsts=true
 inferTypes=false
 inlineConstantVars=false
 inlineFunctionsLevel=LOCAL_ONLY
 inlineGetters=false
 inlineLocalVariables=true
 inlineProperties=false
 inlineVariables=false
 inputDelimiter=// Input %num%
 inputSourceMaps={}
 instrumentForCoverage=false
 instrumentForCoverageOnly=false
 instrumentBranchCoverage=false
 isolatePolyfills=false
 j2clMinifierEnabled=true
 j2clPassMode=AUTO
 labelRenaming=true
 languageIn=ECMASCRIPT_2019
 languageOutIsDefaultStrict=Optional.absent()
 legacyCodeCompile=false
 lineBreak=false
 lineLengthThreshold=500
 markAsCompiled=false
 maxFunctionSizeAfterInlining=-1
 moduleRoots=[./]
 chunksToPrintAfterEachPassRegexList=[]
 moveFunctionDeclarations=false
 nameGenerator=com.google.javascript.jscomp.DefaultNameGenerator@32464a14
 optimizeArgumentsArray=true
 optimizeCalls=false
 outputFeatureSet=Optional.absent()
 outputJs=NORMAL
 outputJsStringUsage=false
 parentChunkCanSeeSymbolsDeclaredInChildren=false
 parseJsDocDocumentation=TYPES_ONLY
 pathEscaper=ESCAPE
 polymerExportPolicy=LEGACY
 preferLineBreakAtEndOfFile=false
 preferSingleQuotes=false
 preferStableNames=false
 preserveDetailedSourceInfo=false
 preserveGoogProvidesAndRequires=false
 preserveTypeAnnotations=false
 prettyPrint=false
 preventLibraryInjection=false
 printConfig=true
 printInputDelimiter=false
 printSourceAfterEachPass=false
 processCommonJSModules=false
 propertyInvalidationErrors={}
 propertyRenaming=OFF
 protectHiddenSideEffects=true
 quoteKeywordProperties=false
 removeAbstractMethods=false
 removeClosureAsserts=false
 removeJ2clAsserts=true
 removeDeadCode=true
 removeUnusedClassProperties=false
 removeUnusedConstructorProperties=false
 removeUnusedLocalVars=true
 removeUnusedPrototypeProperties=false
 removeUnusedPrototypePropertiesInExterns=false
 removeUnusedVars=false
 renamePrefixNamespaceAssumeCrossChunkNames=false
 replaceIdGenerators=false
 replaceMessagesWithChromeI18n=false
 replaceStringsFunctionDescriptions=[]
 replaceStringsPlaceholderToken=
 replaceStringsReservedStrings=[]
 reserveRawExports=false
 rewriteFunctionExpressions=false
 rewritePolyfills=false
 runtimeTypeCheck=false
 shadowVariables=true
 rewriteModulesBeforeTypechecking=true
 skipNonTranspilationPasses=false
 smartNameRemoval=false
 sourceMapDetailLevel=ALL
 sourceMapFormat=DEFAULT
 sourceMapLocationMappings=[]
 stripNamePrefixes=[]
 stripNameSuffixes=[]
 stripTypePrefixes=[]
 stripTypes=[]
 summaryDetailLevel=1
 tracer=OFF
 transformAMDToCJSModules=false
 trustedStrings=false
 tweakProcessing=OFF
 tweakReplacements={}
 emitUseStrict=Optional.absent()
 useTypesForLocalOptimization=false
 variableRenaming=LOCAL
 warningsGuard=DiagnosticGroup<checkVars>(OFF)
 DiagnosticGroup<es5Strict>(ERROR)
 DiagnosticGroup<boundedGenerics>(OFF)
 com.google.javascript.jscomp.DiagnosticGroup@4e4aea35(OFF)
 wrapGoogModulesForWhitespaceOnly=true

Affects: v20200405

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