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This is a partial step towards moving away from static typechecking of instances (we will be dynamically checking whether a model implements a theory in the future). The
@fail
macro was supposed to be helpful way to make getting the context of an error in the validation methods (overloads of the names of type constructors). It required some macro + closure trickery that's ultimately too difficult to maintain while making other required changes to GATlab for the Catlab refactor.