Migrated from http://lampsvn.epfl.ch/trac/scala/ticket/646
Reporter dragos
I think similar bugs have been reported before, here's another one (tested with last night's build).
Type the following code:

  def output = {
    for ((keys, va|))

when pressing on 'l' where the cursor is, Eclipse will hang. This is the stack trace:

"main" prio=10 tid=0x080b1c00 nid=0x722 runnable [0xffff9000..0xffffd368]
   java.lang.Thread.State: RUNNABLE
        at lampion.compiler.Parsers$FileImpl$ParseNodeImpl$ParserImpl$class.node(Parsers.scala:142)
        at scala.tools.editor.Parsers$FileImpl$ParseNodeImpl$Parser.node(Parsers.scala:257)
        at scala.tools.editor.Parsers$Parser.skip(Parsers.scala:24)
        at scala.tools.nsc.ast.parser.Parsers$Parser.syntaxError(Parsers.scala:243)
        at scala.tools.nsc.ast.parser.Parsers$Parser.syntaxErrorOrIncomplete(Parsers.scala:253)
        at scala.tools.nsc.ast.parser.Parsers$Parser$$anonfun$blockStatSeq$1.apply(Parsers.scala:2468)
        at scala.tools.nsc.ast.parser.Parsers$Parser$$anonfun$blockStatSeq$1.apply(Parsers.scala:2450)
        at scala.tools.nsc.ast.parser.Parsers$Parser.checkNoEscapingPlaceholders(Parsers.scala:170)
        at scala.tools.nsc.ast.parser.Parsers$Parser.blockStatSeq(Parsers.scala:2450)
        at scala.tools.nsc.ast.parser.Parsers$Parser.block(Parsers.scala:1241)
        at scala.tools.nsc.ast.parser.Parsers$Parser.blockExpr(Parsers.scala:1232)
        at scala.tools.nsc.ast.parser.Parsers$Parser.simpleExpr(Parsers.scala:1174)
        at scala.tools.nsc.ast.parser.Parsers$Parser.prefixExpr(Parsers.scala:1136)
        at scala.tools.nsc.ast.parser.Parsers$Parser.postfixExpr(Parsers.scala:1088)
        at scala.tools.nsc.ast.parser.Parsers$Parser.expr(Parsers.scala:1025)
        at scala.tools.nsc.ast.parser.Parsers$Parser.expr(Parsers.scala:942)
        at scala.tools.nsc.ast.parser.Parsers$Parser.patDefOrDcl(Parsers.scala:1968)
        at scala.tools.nsc.ast.parser.Parsers$Parser.defOrDcl(Parsers.scala:1927)
        at scala.tools.nsc.ast.parser.Parsers$Parser.nonLocalDefOrDcl(Parsers.scala:1943)
        at scala.tools.editor.Parsers$Parser.nonLocalDefOrDcl0(Parsers.scala:80)
        at scala.tools.editor.Parsers$NonLocalDefOrDcl$.apply(Parsers.scala:174)
        at scala.tools.editor.Parsers$NonLocalDefOrDcl$.apply(Parsers.scala:173)
        at scala.tools.editor.Parsers$FileImpl$ParseNodeImpl$Parser.doParse(Parsers.scala:262)
        at lampion.compiler.Parsers$ParseNodeImpl$class.parseInner(Parsers.scala:72)
        at scala.tools.editor.Driver$ProjectImpl$FileImpl$ParseNode.lampion$compiler$Tokenizers$FileImpl$ParseNodeImpl$$super$parseInner(Driver.scala:19)
        at lampion.compiler.Tokenizers$FileImpl$ParseNodeImpl$class.parseInner(Tokenizers.scala:118)
        at scala.tools.editor.Driver$ProjectImpl$FileImpl$ParseNode.parseInner(Driver.scala:19)
        at lampion.compiler.Parsers$FileImpl$ParseNodeImpl$class.doParse(Parsers.scala:218)
        at scala.tools.editor.Driver$ProjectImpl$FileImpl$ParseNode.doParse(Driver.scala:19)
        at lampion.compiler.Parsers$FileImpl$class.doParsing(Parsers.scala:263)
        at scala.tools.eclipse.Driver$Project$File.lampion$presentation$Matchers$ProjectImpl$FileImpl$$super$doParsing(Driver.scala:13)
        at lampion.presentation.Matchers$ProjectImpl$FileImpl$class.doParsing(Matchers.scala:11)
        at scala.tools.eclipse.Driver$Project$File.doParsing(Driver.scala:13)
        at lampion.presentation.Presentations$ProjectImpl$FileImpl$class.processEdit(Presentations.scala:125)
        at scala.tools.eclipse.Driver$Project$File.processEdit(Driver.scala:13)
        at lampion.eclipse.SourceViewer$$anonfun$catchUp$1.apply(SourceViewer.scala:39)
        at lampion.eclipse.SourceViewer$$anonfun$catchUp$1.apply(SourceViewer.scala:39)
        at scala.Option.foreach(Option.scala:94)
        at lampion.eclipse.SourceViewer.catchUp(SourceViewer.scala:39)
        at lampion.eclipse.Editor.catchUp(Editor.scala:366)
        at lampion.eclipse.Editor$modifyListener$.modifyText(Editor.scala:215)
        at org.eclipse.swt.custom.StyledTextListener.handleEvent(StyledTextListener.java:31)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1125)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1110)
        at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:951)
        at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:5767)
        at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:6500)
        at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2155)
        at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5029)
        at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5054)
        at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:4800)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1125)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1110)
        at org.eclipse.swt.widgets.Widget.sendIMKeyEvent(Widget.java:1187)
        at org.eclipse.swt.widgets.Control.gtk_commit(Control.java:2383)
        at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1476)
        at org.eclipse.swt.widgets.Control.windowProc(Control.java:4234)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:3973)
        at org.eclipse.swt.internal.gtk.OS._gtk_im_context_filter_keypress(Native Method)
        at org.eclipse.swt.internal.gtk.OS.gtk_im_context_filter_keypress(OS.java:5134)
        at org.eclipse.swt.widgets.Control.filterKey(Control.java:1853)
        at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:2526)
        at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:679)
        at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1486)
        at org.eclipse.swt.widgets.Control.windowProc(Control.java:4234)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:3973)
        at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
        at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:5593)
        at org.eclipse.swt.widgets.Display.eventProc(Display.java:1192)
        at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
        at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:1487)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2969)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
        at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1173)