diff options
Diffstat (limited to 'spartan/lib/Maybe.thy')
| -rw-r--r-- | spartan/lib/Maybe.thy | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/spartan/lib/Maybe.thy b/spartan/lib/Maybe.thy index 0a7ec21..da22a4e 100644 --- a/spartan/lib/Maybe.thy +++ b/spartan/lib/Maybe.thy @@ -25,10 +25,10 @@ Definition MaybeInd: "\<And>a. a: A \<Longrightarrow> f a: C (some A a)" "m: Maybe A" shows "C m" - using assms[unfolded Maybe_def none_def some_def] + using assms[unfolded Maybe_def none_def some_def, type] apply (elim m) - apply (rule \<open>_ \<Longrightarrow> _: C (inl _ _ _)\<close>) - apply (elim, rule \<open>_: C (inr _ _ _)\<close>) + apply fact + apply (elim, fact) done Lemma Maybe_comp_none: |