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WIP. Not actually intended to be merged.
@raulraja @javierfs89 Puretest currently supports finally tagless implementations, so we tried it first to adapt the finally tagless tests of freestyle, and give them a simple interpretation with either. This seems to work. Then, we gave also an instance for FreeS, though we were not able to come up with a clean implementation. Surely, this can be significantly improved. Anyway, IMO, the right approach to support Free is through a new implementation of the Puretest DSL in terms of freestyle's @free.