Fix associative-commutative relations and the use of term walk groundedness #27
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This comes along with a warning/clarification to the assoccomm relations. They have always walked the first argument, which, when used with the old `ground_order` would only account for improperly ordered terms when the second argument was fully ground (and the first wasn't). However, it would perform this check repeatedly, incurring a full-traversal cost on every iteration. This inefficiency has been rectified. The new "shallow" ground order should accomplish the same--and more--by reordering according to "groundness" only at next level of traversal. The assoccomm goals need to be updated so that they properly use this shallow ordering, though.
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I've recently added a new test (an expected failure) that demonstrates how poorly the The test creates a decently sized term graph containing assoc-comm operators and another one that differs only at the top-level (i.e. one graph starts with an |
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ground_orderdoesn't really order terms in a way that avoids infinite recursion interm_walko(e.g. when called by thekanren.assoccommgoals). There should be a way to handle this—at least better than it currently does.