[Ecls-list] unbound-variable handler

[Pierre THIERRY]

Scribit Dean O'Connor dies 19/06/2007 hora 03:03:
> I am trying to setup a handler to catch "unbound-variable".

The thing is, if I understand the condition system correctly, you need
to setup a restart around the expression that might be unbound:

(handler-bind
    ((unbound-variable (lambda (c)
			 (declare (ignore c))
			 (invoke-restart 'use-nil))))
  (not (restart-case
	   not-yet-bound-variable
	 (use-nil () nil))))

Works in SBCL and ECL (yields t).

Quickly,
Pierre
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