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I've installed the latest nightly. And get the following exception whenever I try to trigger a rename refactoring on a Java Element. java.lang.UnsupportedOperationException: getReferenceDescriptions() at org.eclipse.xtext.builder.clustering.CopiedResourceDescription.getReferenceDescriptions(CopiedResourceDescription.java:74) at org.eclipse.xtext.ui.editor.findrefs.DefaultReferenceFinder.findIndexedReferences(DefaultReferenceFinder.java:188) at org.eclipse.xtext.ui.editor.findrefs.DefaultReferenceFinder.findIndexedReferences(DefaultReferenceFinder.java:67) at org.eclipse.xtext.ui.editor.findrefs.DefaultReferenceFinder.findAllReferences(DefaultReferenceFinder.java:61) at org.eclipse.xtext.ui.refactoring.impl.ReferenceUpdaterDispatcher.createReferenceUpdates(ReferenceUpdaterDispatcher.java:53) at org.eclipse.xtext.ui.refactoring.impl.RenameElementProcessor.checkFinalConditions(RenameElementProcessor.java:213) at org.eclipse.xtext.ui.refactoring.impl.AbstractProcessorBasedRenameParticipant.checkConditions(AbstractProcessorBasedRenameParticipant.java:112) at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:257) at org.eclipse.ltk.core.refactoring.CheckConditionsOperation.run(CheckConditionsOperation.java:85) at org.eclipse.ltk.core.refactoring.CreateChangeOperation.run(CreateChangeOperation.java:121) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344) at org.eclipse.ltk.internal.ui.refactoring.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
*** This bug has been marked as a duplicate of bug 344373 ***