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This allows results to be naturally reported as lazy trees, rather than as lists representing a tree traversal. This in turn means that the actual bound can be moved outwards to the testing code, and not used at all in the runner. Trees let us do nice things with shrinking and short-circuiting, if we make the (fairly reasonable) assumption that the children of a buggy result will exhibit the same bug. Storing results as trees does complicate the predicate helper functions somewhat, but I think the clarity gained in the actual SCT code is well worth it. |
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Extra.hs |