java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:126)
   at com.sun.tools.javac.util.Assert.check(Assert.java:45)
   at com.sun.tools.javac.util.Bits.incl(Bits.java:88)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.checkInit(Flow.java:1475)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitIdent(Flow.java:2174)
   at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:1923)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1506)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitBinary(Flow.java:2167)
   at com.sun.tools.javac.tree.JCTree$JCBinary.accept(JCTree.java:1703)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1506)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitLambda(Flow.java:2076)
   at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1539)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1506)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExprs(Flow.java:1516)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitApply(Flow.java:2051)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1398)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.scanExpr(Flow.java:1506)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitVarDef(Flow.java:1686)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:786)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitBlock(Flow.java:1696)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:842)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitMethodDef(Flow.java:1650)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:726)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitClassDef(Flow.java:1610)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:647)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2218)
   at com.sun.tools.javac.comp.Flow$AssignAnalyzer.analyzeTree(Flow.java:2195)
   at com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:208)
   at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1324)
   at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1298)
   at com.sun.tools.javac.api.JavacTaskImpl$1.process(JavacTaskImpl.java:468)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:618)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:471)
   at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:257)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:232)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:158)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:259)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:156)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2457)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$1500(RepositoryUpdater.java:2057)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:2364)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:2362)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:541)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2362)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:2865)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3218)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:2959)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:5189)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4800(RepositoryUpdater.java:4881)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:5126)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:96)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:5122)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:5118)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:5118)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)