The unification operation on 2-3-4 trees tests if they are structurally
equal. They might also be considered equal if their sets of key-value pairs
are equivalent. I've created an equal/2 predicate in the tree234 and
map modules in the standard library to test this.
library/tree234.m:
Implement a predicate to test for tree234 equivalence.
library/map.m:
Forward map.equal/2 to tree234.equal/2.
NEWS:
Announce this change in the news file.
tests/general/map_equal.m:
tests/general/map_equal.exp:
Add test case for map.equal/2
tests/general/Mmakefile:
Include the new test case.
