cleanup

platform/util-rt/src/com/intellij/util/NullableFunction.java

@@ -21,6 +21,7 @@ import org.jetbrains.annotations.Nullable;
  * @author peter
  */
 public interface NullableFunction<Param, Result> extends Function<Param, Result> {
+  @Override
   @Nullable
   Result fun(final Param param);
 
@@ -28,6 +29,7 @@ public interface NullableFunction<Param, Result> extends Function<Param, Result>
    * @see FunctionUtil#nullConstant()
    */
   NullableFunction NULL = new NullableFunction() {
+    @Override
     public Object fun(final Object o) {
       return null;
     }