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java.lang.UnsupportedOperationException: 	at java.util.AbstractList.add(AbstractList.java:148)	at java.util.AbstractList.add(AbstractList.java:108)	at com.intellij.refactoring.rename.inplace.InplaceRefactoring.addReferenceIfNeeded(InplaceRefactoring.java:557)	at com.intellij.refactoring.rename.inplace.InplaceRefactoring.addReferenceAtCaret(InplaceRefactoring.java:551)	at com.intellij.refactoring.rename.inplace.InplaceRefactoring.performInplaceRefactoring(InplaceRefactoring.java:184)	at com.intellij.refactoring.rename.inplace.VariableInplaceRenamer.performInplaceRename(VariableInplaceRenamer.java:94)	at com.intellij.refactoring.rename.inplace.VariableInplaceRenameHandler.doRename(VariableInplaceRenameHandler.java:121)	at com.intellij.refactoring.rename.inplace.VariableInplaceRenameHandler.invoke(VariableInplaceRenameHandler.java:90)	at org.intellij.plugins.ceylon.ide.ceylonCode.refactoring.AbstractExtractHandler.createAndIntroduceValue(AbstractExtractHandler.ceylon:187)	at org.intellij.plugins.ceylon.ide.ceylonCode.refactoring.AbstractExtractHandler.extractToScope(AbstractExtractHandler.ceylon:83)	at org.intellij.plugins.ceylon.ide.ceylonCode.refactoring.AbstractExtractHandler.extractSelectedExpression$priv$(AbstractExtractHandler.ceylon:113)	at org.intellij.plugins.ceylon.ide.ceylonCode.refactoring.AbstractExtractHandler.invoke(AbstractExtractHandler.ceylon:97)	at com.intellij.refactoring.actions.BaseRefactoringAction.actionPerformed(BaseRefactoringAction.java:134)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:182)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:311)	at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:958)	at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:281)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:109)	at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:513)	at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:45)	at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:533)	at java.awt.Component.processMouseEvent(Component.java:6533)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6298)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4889)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2746)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:866)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:381)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)