From 2fcf81cc4b132bf7d862f5144d282391b38d0c15 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Fri, 5 Nov 2010 10:41:23 -0700
Subject: Revert "Move the option type to its own module"

---
 src/lib/util.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/lib/util.rs')

diff --git a/src/lib/util.rs b/src/lib/util.rs
index 72844d5f..f6e1327b 100644
--- a/src/lib/util.rs
+++ b/src/lib/util.rs
@@ -1,3 +1,21 @@
+tag option[T] {
+    none;
+    some(T);
+}
+
+type operator[T, U] = fn(&T) -> U;
+
+fn option_map[T, U](&operator[T, U] f, &option[T] opt) -> option[U] {
+    alt (opt) {
+        case (some[T](?x)) {
+            ret some[U](f(x));
+        }
+        case (none[T]) {
+            ret none[U];
+        }
+    }
+}
+
 fn id[T](&T x) -> T {
     ret x;
 }
-- 
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