Add an insert_with_key function to the Map trait

src/test/run-pass/class-impl-very-parameterized-trait.rs

@@ -61,6 +61,14 @@ impl<T: Copy> cat<T> : Map<int, T> {
      else { None }
   }
 
+  fn insert_with_key(ff: fn(+k: int, +v0: T, +v1: T) -> T, +key: int, +val: T) -> bool {
+    match self.find(key) {
+      None            => return self.insert(key, val),
+      Some(copy orig) => return self.insert(key, ff(key, orig, val))
+    }
+  }
+
+
   fn remove(+k:int) -> bool {
     match self.find(k) {
       Some(x) => {