uncons<B> method
Implementation
B uncons<B>(B z(), B f(A head, IList<A> tail)) => _isCons() ? f(_unsafeHead(), _unsafeTail()) : z();
B uncons<B>(B z(), B f(A head, IList<A> tail)) => _isCons() ? f(_unsafeHead(), _unsafeTail()) : z();