[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] pushRcvr fails for context instances whose sender has been set to an Integer instance (Issue #654)

[Eliot Miranda]

Ah, of course.  I understand now.  Setting to an integer has disastrous consequences for the vm.  That must be prevented.

Possibly by coincidence Jaromir brought up the issue on squeak-dev, suggesting

```Context>>privSender: aContextOrNil
 
        sender := aContextOrNil ifNotNil: [aContextOrNil asContext]```

which I think is good.  I would validate by sending asContext in the relevant places.  If necessary we can introduce something only understood by Context and not by BlockClosure, eg raiseErrorIfNotContext, which I suppose could be implemented in Object to raise an error.



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