diff -r 296b478df14e -r e6e5750f1311 src/Pure/Concurrent/par_list.ML
--- a/src/Pure/Concurrent/par_list.ML	Mon Apr 09 15:10:52 2012 +0200
+++ b/src/Pure/Concurrent/par_list.ML	Mon Apr 09 17:22:23 2012 +0200
@@ -39,8 +39,7 @@
         Future.forks {name = name, group = SOME group, deps = [], pri = 0, interrupts = true}
           (map (fn x => fn () => f x) xs);
       val results = Future.join_results futures
-        handle exn =>
-          (if Exn.is_interrupt exn then ignore (Future.cancel_group group) else (); reraise exn);
+        handle exn => (if Exn.is_interrupt exn then Future.cancel_group group else (); reraise exn);
     in results end;
 
 fun map_name name f xs = Par_Exn.release_first (managed_results name f xs);