Increase testability of constraint failures #351
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On unfulfilled constraints, don't just print strings to stderr, but return a dedicated type. Also, restructure test helper functions. In particular, return fewer tuples, use dedicated types instead.
jan-ferdinand
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On unfulfilled constraints, don't just print strings to stderr, but return a dedicated type.
Also, restructure test helper functions. In particular, return fewer tuples, use dedicated types instead.