[m-dev.] Adding Loops to Mercury

[Peter Schachte]

On 08/01/14 23:58, Mark Brown wrote:

> Currently in Mercury I can define an instance for foldable(map(K, V),
> pair(K, V)), but not foldable(list(T), T) or foldable(set(T), T).

That's weird.  I can't see why the former would be workable if the
latter two are not.

Would foldable(list(T), useless_wrapper(T)) work, where

    :- type useless_wrapper(T) ---> useless_wrapper(T).

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