SWI-Prolog : current_prolog_flag(unknown, fail) is failing.

From: robert.oschler@xxxxxxxxx
Date: 29 Aug 2006 17:19:35 -0700

Hello,

I'm trying to set the "unknown" prolog flag to "fail". "fail" is
listed as a valid value in the reference manaul. The call fails. What
am I doing wrong?

Thanks.

.

Follow-Ups:
- Re: SWI-Prolog : current_prolog_flag(unknown, fail) is failing.
  - From: Jan Wielemaker

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