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Pack weblog -- prolog/support/utils.pl
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it's important that this not become a kitchen sink

 wl_opts(+MatchList:list, +Template:term) is nondet
wl_opts(+MatchList:atom, +Template:term) is nondet

succeeds if MatchList unifies with Template, or MatchList is a list with a member that unifies with template. This is a convenience method when all the generator predicate is is facts.