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next on empty iterator
java.util.NoSuchElementException: next on empty iterator	at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)	at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)	at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:63)	at scala.collection.IterableLike$class.head(IterableLike.scala:107)	at scala.collection.immutable.StringOps.scala$collection$IndexedSeqOptimized$$super$head(StringOps.scala:30)	at scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:126)	at scala.collection.immutable.StringOps.head(StringOps.scala:30)	at scala.collection.TraversableLike$class.last(TraversableLike.scala:459)	at scala.collection.immutable.StringOps.scala$collection$IndexedSeqOptimized$$super$last(StringOps.scala:30)	at scala.collection.IndexedSeqOptimized$class.last(IndexedSeqOptimized.scala:132)	at scala.collection.immutable.StringOps.last(StringOps.scala:30)	at org.jetbrains.plugins.scala.conversion.ConverterUtil$.textWithoutLastSemicolon$1(ConverterUtil.scala:182)	at org.jetbrains.plugins.scala.conversion.ConverterUtil$.compareTextNEq(ConverterUtil.scala:185)	at org.jetbrains.plugins.scala.conversion.copy.JavaCopyPastePostProcessor.collectTransferableData0(JavaCopyPastePostProcessor.scala:96)	at org.jetbrains.plugins.scala.conversion.copy.SingularCopyPastePostProcessor.collectTransferableData(SingularCopyPastePostProcessor.scala:28)	at com.intellij.codeInsight.editorActions.CopyHandler.a(CopyHandler.java:94)	at com.intellij.openapi.project.DumbService.withAlternativeResolveEnabled(DumbService.java:256)	at com.intellij.codeInsight.editorActions.CopyHandler.doExecute(CopyHandler.java:92)	at com.intellij.openapi.editor.actionSystem.EditorActionHandler$4.perform(EditorActionHandler.java:217)	at com.intellij.openapi.editor.actionSystem.EditorActionHandler.doIfEnabled(EditorActionHandler.java:109)	at com.intellij.openapi.editor.actionSystem.EditorActionHandler.execute(EditorActionHandler.java:214)	at com.intellij.openapi.editor.actionSystem.EditorAction.lambda$actionPerformed$0(EditorAction.java:100)	at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:129)	at com.intellij.openapi.editor.actionSystem.EditorAction.actionPerformed(EditorAction.java:109)	at com.intellij.openapi.editor.actionSystem.EditorAction.actionPerformed(EditorAction.java:88)	at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:197)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:213)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher$1.performAction(IdeKeyEventDispatcher.java:587)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.a(IdeKeyEventDispatcher.java:634)	at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:199)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.processAction(IdeKeyEventDispatcher.java:633)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.d(IdeKeyEventDispatcher.java:477)	at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.java:211)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:677)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:385)	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)