diff options
Diffstat (limited to 'lib/OptionMonad.v')
-rw-r--r-- | lib/OptionMonad.v | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/OptionMonad.v b/lib/OptionMonad.v index 824a9c2f..d2563c97 100644 --- a/lib/OptionMonad.v +++ b/lib/OptionMonad.v @@ -13,6 +13,12 @@ Local Open Scope option_monad_scope. (** Simple tactics for option-monad *) +Ltac autodestruct := + let EQ := fresh "EQ" in + match goal with + | |- context f [match ?expr with | _ => _ end] => destruct expr eqn:EQ; generalize EQ; clear EQ; congruence || trivial + end. + Lemma destruct_SOME A B (P: option B -> Prop) (e: option A) (f: A -> option B): (forall x, e = Some x -> P (f x)) -> (e = None -> P None) -> (P (SOME x <- e IN f x)). Proof. |