Add missing cases in fuse (empty subtrees) #3
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When fusing two trees, their subtrees may be just leaves, resulting in the recursive call to fuse returning a leaf. This case does not introduce any new logic, but has to be handled in the patterns. minimal example where the missing case results in an error: delete 3 (foldr insert empty [1..4])
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When fusing two trees, their subtrees may be just leaves, resulting in the recursive call to fuse returning a leaf.
This case does not introduce any new logic, but has to be handled in the patterns. fixes #2
minimal example where the missing case results in an error: