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Pack dialect-ciao -- prolog/dialect/ciao/engine/internals.pl
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 module_concat(+Module, +Goal0, -Goal)
Not clear what this should do. This makes library(tcltk) work ...

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 $setarg(Arg1, Arg2, Arg3, Arg4)