diff options
| author |  Adam Chlipala <adamc@hcoop.net> | 2009-09-15 15:48:53 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2009-09-15 15:48:53 -0400 |
| commit | efa6f97eee79311cd06592ed0241acfc40561785 (patch) | |
| tree | 47760017bfc37999184289878129fd3e64115e52 /lib/ur/option.ur | |
| parent | 8e944e62818045b820f45776a396bc1b66ab3056 (diff) | |
Filters implementation type-checking
Diffstat (limited to 'lib/ur/option.ur')
| -rw-r--r-- | lib/ur/option.ur | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/ur/option.ur b/lib/ur/option.ur index 1f044002..a22cf5b5 100644 --- a/lib/ur/option.ur +++ b/lib/ur/option.ur @@ -7,6 +7,11 @@ fun eq [a] (_ : eq a) = | (Some x, Some y) => x = y | _ => False) +fun isNone [a] x = + case x of + None => True + | Some _ => False + fun isSome [a] x = case x of None => False |