fun <A1, A2, R> f2(f: KFunction2<A1, A2, R>, a1: A1, a2: A2): MetaFeature<R>
Creates a MetaFeature for the given function f which expects 2 arguments.
Notice for assertion function writers: you should use ExpectImpl.feature and pass a
class reference instead of using this convenience function (e.g. ExpectImpl.feature(MyClass::fun, ...)).
This way we are always able to report the function name, even if the subject is not defined which occurs if a
previous transformation of the subject could not be carried out.