oops, fix option.expect() and use it in libstd/map.rs

Author: bblum

src/libcore/option.rs

@@ -136,7 +136,7 @@ impl extensions<T: copy> for option<T> {
 
     Fails if the value equals `none`
     "]
-    pure fn expect<T: copy>(reason: str) -> T { expect(self, reason) }
+    pure fn expect(reason: str) -> T { expect(self, reason) }
 }
 
 #[test]

src/libstd/map.rs

@@ -232,11 +232,11 @@ mod chained {
         }
 
         fn get(k: K) -> V {
-            option::get(self.find(k))
+            self.find(k).expect("Key not found in table")
         }
 
         fn [](k: K) -> V {
-            option::get(self.find(k))
+            self.get(k)
         }
 
         fn remove(k: K) -> option<V> {