这个Ruby代码挂起:
alert(myVar)
所以在Ruby中,如何将STDIN重定向到文件?
答案 0 :(得分:0)
好的,根据提供的变体链接,我得到了它的工作:
Fixpoint rev (l:natlist) : natlist :=
match l with
| nil => nil
| h :: t => rev t ++ [h]
end.
Theorem rev_involutive : forall l : natlist,
rev (rev l) = l.
Proof.
intros l. induction l as [| n l'].
- reflexivity.
- unfold rev.
谢谢!