[slang-users] is_defined

[Morten Bo Johansen <mbj@xxxxxxxxxxx>]

Hi

If I do

  if (is_defined ("foo"))
    foo ();
    
and "foo" is not defined, then this notwithstanding, an error
is thrown: "foo is undefined".

This shouldn't happen, IMO, since the condition was not met,
and then the statement should be silently ignored and no error
thrown.

But maybe there is a reason for this?

Thanks,
Morten
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