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2014-03-07add a Functor structureHelmut Grohne
The intent is to replace some uses of Vec with a structure that also happens to be a functor. RawFunctors from the standard library provide no laws though, so we define a Functor structure that adds the laws. As an additional law congruence is added, because * Other standard library structures in Algebra.Structures also require congruence. * Otherwise the identity law would have to reason about different identities.