Re: unhandled invalid element exception

[Jose E. Marchesi]

Hi Bruno.
    
    I'm getting an "unhandled invalid element exception" when I use a reference
    to a conditional, nested struct field as an array bounds.
    
    Test case:
    
    $ poke
    .load gmo.pk
    .file de.mo
    gmo @ 0#B
    unhandled invalid element exception
    
    The problem is in line 116 of gmo.pk. If I comment it out and use line 115
    instead, I don't get this exception (but then the array size is not the one
    I really want).
    
    It is strange that I get this exception at run time. If there was something
    wrong with my pickle, I would have expected an error at load time.
    
The problem is that header.rev1 is an optional field, and you are
getting the run-time exception because apparently it doesn't exist in
`header', i.e. minor_revision < 1.

There seems to be some integrity problem with your data.  Maybe
sysdep_segments should be optional itself, based on header.revision?