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This library is there to ensure compatibility with QCheck 0.8 and earlier.
It has a unique module QCheck_runner that merges the custom runners from qcheck-core.runner (QCheck_base_runner) and the OUnit runners from qcheck-ounit (QCheck_ounit) into a single module.
By depending on qcheck-core, this library also brings QCheck in scope, so it can be used transparently.