java.lang.AssertionError: ERRONEOUS com.sun.tools.javac.tree.JCTree$JCErroneous
   at org.netbeans.modules.java.source.save.CasualDiff.treesMatch(CasualDiff.java:2122)
   at org.netbeans.modules.java.source.save.CasualDiff.treesMatch(CasualDiff.java:1970)
   at org.netbeans.modules.java.source.save.CasualDiff.listsMatch(CasualDiff.java:3549)
   at org.netbeans.modules.java.source.save.CasualDiff.diffApply(CasualDiff.java:1350)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:3362)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3231)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3219)
   at org.netbeans.modules.java.source.save.CasualDiff.diffVarDef(CasualDiff.java:802)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:3298)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3231)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3219)
   at org.netbeans.modules.java.source.save.CasualDiff.diffList(CasualDiff.java:2830)
   at org.netbeans.modules.java.source.save.CasualDiff.diffBlock(CasualDiff.java:872)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:3305)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3231)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3219)
   at org.netbeans.modules.java.source.save.CasualDiff.diffMethodDef(CasualDiff.java:702)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:3295)
   at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:3231)
   at org.netbeans.modules.java.source.save.CasualDiff.diff(CasualDiff.java:210)
   at org.netbeans.api.java.source.WorkingCopy.processCurrentCompilationUnit(WorkingCopy.java:601)
   at org.netbeans.api.java.source.WorkingCopy.getChanges(WorkingCopy.java:767)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:647)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:634)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:488)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:583)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:150)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:134)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:200)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:197)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:197)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:102)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:438)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:409)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:655)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint$IntroduceFix.implement(IntroduceHint.java:1494)
   at org.netbeans.modules.java.hints.introduce.IntroduceAction.doPerformAction(IntroduceAction.java:225)
   at org.netbeans.modules.java.hints.introduce.IntroduceAction.perform(IntroduceAction.java:114)
   at org.netbeans.modules.java.hints.infrastructure.HintAction.doPerform(HintAction.java:115)
   at org.netbeans.modules.java.hints.infrastructure.HintAction.actionPerformed(HintAction.java:88)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
   at java.awt.Component.processMouseEvent(Component.java:6505)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6270)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4492)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2719)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:682)
   at java.awt.EventQueue$3.run(EventQueue.java:680)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:696)
   at java.awt.EventQueue$4.run(EventQueue.java:694)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)