#497 Calling 'where' with an undefined variable causes SEGFAULT

[Kalith]

Openging gdl an typing :
print, where(a eq 1)
... generates a segmentation fault.
For the same code, IDL prints '% Variable is undefined: A.'.

[Alain C.]

thanks you for this important bug report.
Unfortunately, it is more tricky and more fundamental :(

GDL> print, a eq 0
Erreur de segmentation

[Marc Schellens]

This bug was introduced along with !NULL. Thanks for reporting.