[mercury-users] Hashtable modes (foldl)

[Robert Colvin]

Hi,

Is it possible to use hash_tables as the accumulator to foldl/4?  

The mode listing for the first (pred) parameter to foldl/4 doesn't
list "pred(in, di, out)", which appears to be what is required
(hash_table_di = di(hash_table), hash_table_uo = out(hash_table)).

Perhaps there is another data structure I should be using instead?
(It looks like I could get version_hash_table to work, but I won't
need to access previous versions)

Thanks,
Rob
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