PSPP-BUG: [bug #21108] crashing after bad input program

[Ben Pfaff]

Update of bug #21108 (project pspp):

                  Status:   Ready for Test/Review => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #3:

>Looks good to me.

Thanks, I checked it in.

>I wonder if there's a way to auto-generate tests for procedures 
>which are likely to share these sort of problems.

I've been wondering for a while whether there's a good way to auto-generate a
number of tests.  We've had too many bugs of the form "if I combine a couple
of incredibly simple things in a particular order, stuff breaks".  I think
so--I think that it can be done via the model checker library, or perhaps a
simpler way.  But I haven't yet got around to trying out any of my ideas.

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