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| author |  Benjamin Barenblat <bbaren@mit.edu> | 2020-05-30 19:49:56 -0400 |
|---|---|---|
| committer | Benjamin Barenblat <bbaren@mit.edu> | 2020-05-30 19:49:56 -0400 |
| commit | c2f1e1096f602b1cbd4531352f3e1ea6d656a186 (patch) | |
| tree | ae102982878bb0c31bdfe07209e60bfc14030490 /lib/ur/option.ur | |
| parent | 095c2640aa2070ed4e2765875238d5e6e6673856 (diff) | |
| parent | 5a0b639dfbd7db9d16c6995f72ba17152a1f362d (diff) | |
Merge branch 'upstream' into dfsg_clean20200209+dfsgdfsg_clean
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 baa08466..dd186161 100644 --- a/lib/ur/option.ur +++ b/lib/ur/option.ur @@ -59,3 +59,8 @@ fun unsafeGet [a] (o : option a) = case o of None => error <xml>Option.unsafeGet: encountered None</xml> | Some v => v + +fun mapM [m] (_ : monad m) [a] [b] (f : a -> m b) (x : t a) : m (t b) = + case x of + None => return None + | Some y => z <- f y; return (Some z) |