My RCP app was using http://pydev.org/updates for PyDev, which was 
upgraded yesterday (I think) from PyDev 4.4 to 4.5. I'm using 4.4 now 
after switching to https://dl.bintray.com/fabioz/pydev/all/, but I'd 
like to run with 4.5, and I have a problem with it.

When I launch the app, the console gets flooded with numerous instances 
of the stack trace below. The line of my code that leads to the 
exception (MidasActivator line 339) is this

IInterpreterManager manager = ...
manager.setInfos(new IInterpreterInfo[] {xmpyInterp}, null, new 
NullProgressMonitor());

I'm updating the python interpreter there after adding a pypredef location.

This doesn't happen in PyDev 4.4. Also it doesn't happen in PyDev 4.5 if 
I omit the com.python.pydev plug-ins from my product (specifically 
com.python.pydev.analysis). In that case, I get an NPE when PyDev checks 
if the interpreters are synced with the environment. I can prevent that 
exception my implementing a contribution to extension 
org.python.pydev.pydev_interpreter_info_builder which does nothing.

So I don't know if I've got something in my code that is incompatible 
with PyDev 4.5, or is implementing an info builder extension that does 
nothing the expected pattern? I would think that including the 
com.python.pydev plug-ins is expected, in whch case I need to figure out 
why I get exceptions when I do.

!ENTRY org.python.pydev.shared_core 4 4 2016-01-19 11:24:53.650
!MESSAGE Did not expect to find item below node: 
Assign[targets=[Name[id=this, ctx=Store, reserved=false]], value=null] 
(module: __init__.py).
!STACK 0
java.lang.RuntimeException: Did not expect to find item below node: 
Assign[targets=[Name[id=this, ctx=Store, reserved=false]], value=null] 
(module: __init__.py).
     at org.python.pydev.core.log.Log.log(Log.java:54)
     at 
org.python.pydev.parser.fastparser.FastDefinitionsParser.endScopesInStack(FastDefinitionsParser.java:589)
     at 
org.python.pydev.parser.fastparser.FastDefinitionsParser.handleNewLine(FastDefinitionsParser.java:380)
     at 
org.python.pydev.parser.fastparser.FastDefinitionsParser.extractBody(FastDefinitionsParser.java:249)
     at 
org.python.pydev.parser.fastparser.FastDefinitionsParser.parse(FastDefinitionsParser.java:676)
     at 
com.python.pydev.analysis.additionalinfo.AbstractAdditionalTokensInfo.addAstInfo(AbstractAdditionalTokensInfo.java:310)
     at 
com.python.pydev.analysis.additionalinfo.AbstractAdditionalInfoWithBuild.restoreInfoForModuleManager(AbstractAdditionalInfoWithBuild.java:258)
     at 
com.python.pydev.analysis.additionalinfo.AdditionalSystemInterpreterInfo.recreateAllInfo(AdditionalSystemInterpreterInfo.java:179)
     at 
com.python.pydev.analysis.additionalinfo.builders.InterpreterObserver.notifyDefaultPythonpathRestored(InterpreterObserver.java:35)
     at 
org.python.pydev.ui.interpreters.AbstractInterpreterManager.restorePythopathForInterpreters(AbstractInterpreterManager.java:726)
     at 
org.python.pydev.ui.interpreters.AbstractInterpreterManager.setInfos(AbstractInterpreterManager.java:643)
     at 
gov.midas.ide.ui.MidasActivator.configurePydevPredfinedCompletion(MidasActivator.java:339)
     at gov.midas.ide.ui.MidasActivator.start(MidasActivator.java:109)
     at 
org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:771)
     at 
org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
     at java.security.AccessController.doPrivileged(Native Method)
     at 
org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)
     at 
org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)
     at 
org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:941)
     at 
org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:318)
     at org.eclipse.osgi.container.Module.doStart(Module.java:571)
     at org.eclipse.osgi.container.Module.start(Module.java:439)
     at 
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1582)
     at 
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1562)
     at 
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1533)
     at 
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1476)
     at 
org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)
     at 
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
     at 
org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)

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