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Predicate debug/1
Availability::- use_module(library(debug)).(can be autoloaded)
Source[det]debug(+Topic)
[det]nodebug(+Topic)
Add/remove a topic from being printed. nodebug(_) removes all topics. Gives a warning if the topic is not defined unless it is used from a directive. The latter allows placing debug topics at the start of a (load-)file without warnings.

For debug/1, Topic can be a term Topic > Out, where Out is either a stream or stream-alias or a filename (atom). This redirects debug information on this topic to the given output.

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Chris Mungall said (2016-12-29T21:04:07):0 upvotes 0 0 downvotes
Picture of user Chris Mungall.

it's not totally clear from the docs how to remove unwanted "no matching debug topic (yet)" messages. The docs say a warning is emitted (a) if the topic is "defined" and (b) it is not used from a directive.

There isn't really any instruction on how to "define" topics, other than via debug/1... which prints the warning!

It seems the preferred way to do this is to declare the topics as directives using nodebug/1

:- nodebug(topic1).
:- nodebug(topic2).
...

See: https://github.com/evoldoers/biomake/issues/31