[m-rev.] for review: fix behaviour of bimap.from_assoc_list

[Ralph Becket]

Ian MacLarty, Monday,  7 March 2005:
> 
> It would be better if there were a version that just failed, since then 
> the user wouldn't need to check the bijective property before calling 
> bimap.from_assoc_list.  This would also be more consistent with other 
> conversion predicates like string.to_int which fail if the conversion is 
> not possible.  I suggest the version which throws an exception should 
> have the usual "det_" prefix.

I disagree.  If the user wants to treat the assoc_list as a sequence of
updates to an empty bimap they should use something like

	BiMap = foldl(bimap.set, AssocList, BiMap0)

-- Ralph
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