[m-dev.] for review: add lazy evaluation to library

[Fergus Henderson]

On 10-Mar-1999, Peter Schachte <schachte at cs.mu.OZ.AU> wrote:
> > :- pragma c_code(inst_cast(F::in) = (F2::out(lazy)),
> > 	[will_not_call_mercury, thread_safe], "F = F2;").
> 
> Uh.  There really ought to be a prettier way to do this....

Yes, particularly since C code doesn't have unification or mode checking --
the above should of course be "F2 = F" rather than "F = F2"!

-- 
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