Improve tests for the ISO Prolog standard `(-)/1 built-in function
Improve tests for the ISO Prolog standard `(-)/1 built-in function

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3