I'll defer to Jay, but the main points are:

On Saturday, January 19, 2019 at 5:01:26 AM UTC+9, Vincent St-Amour wrote:
>
> Leo Uino 
> - lots of racklog changes 
>

Many cases of logic variable bindings being incorrectly unwound are now 
fixed.

Logic variables containing predicates may now be used in procedure 
applications.

Introduced the %andmap higher-order predicate.


Leo

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