From f6cfaea8a7eb777dae12337178c3b9a268459995 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Tue, 9 Jun 2009 18:11:59 -0400
Subject: Some standard library reorgs and additions; handle mutual datatypes
 better in Specialize

---
 lib/ur/option.ur | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'lib/ur/option.ur')

diff --git a/lib/ur/option.ur b/lib/ur/option.ur
index 5ec093c0..1f044002 100644
--- a/lib/ur/option.ur
+++ b/lib/ur/option.ur
@@ -1,5 +1,12 @@
 datatype t = datatype Basis.option
 
+fun eq [a] (_ : eq a) =
+    mkEq (fn x y =>
+             case (x, y) of
+                 (None, None) => True
+               | (Some x, Some y) => x = y
+               | _ => False)
+
 fun isSome [a] x =
     case x of
         None => False
@@ -9,3 +16,8 @@ fun mp [a] [b] f x =
     case x of
         None => None
       | Some y => Some (f y)
+
+fun bind [a] [b] f x =
+    case x of
+        None => None
+      | Some y => f y
-- 
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