fold<R> abstract method
Implementation
R fold<R>(R ifPure(A a), R ifSuspend(F fa), R ifBind(Free<F, dynamic> ffb, _FreeF<F, A> f));
R fold<R>(R ifPure(A a), R ifSuspend(F fa), R ifBind(Free<F, dynamic> ffb, _FreeF<F, A> f));