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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
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+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
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+  Developers that use our General Public Licenses protect your rights
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+  A secondary benefit of defending all users' freedom is that
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+The GNU General Public License permits making a modified version and
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+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
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+
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/reactive.cabal b/reactive.cabal
--- a/reactive.cabal
+++ b/reactive.cabal
@@ -1,6 +1,6 @@
 Name:                reactive
-Version:             0.10.7
-Synopsis:            Simple foundation for functional reactive programming
+Version:             0.11
+Synopsis:            Push-pull functional reactive programming
 Category:            reactivity, FRP
 Description:
   /Reactive/ is a simple foundation for programming reactive systems
@@ -9,32 +9,35 @@
   demand/data-driven implementation, as described in the paper \"Simply
   efficient functional reactivity\", <http://conal.net/papers/simply-reactive/>.
   .
-  Import "FRP.Reactive" for FRP client apps.  To make an Reactive adapter for an
+  Import "FRP.Reactive" for FRP client apps.  To make a Reactive adapter for an
   imperative library, import "FRP.Reactive.LegacyAdapters".
   .
   Please see the project wiki page: <http://haskell.org/haskellwiki/reactive>
   .
-  &#169; 2007-2008 by Conal Elliott; BSD3 license.
+  &#169; 2007-2008 by Conal Elliott; GNU AGPLv3 license (see COPYING).
   .
   With contributions from: Robin Green, Thomas Davie, Luke Palmer,
   David Sankel, Jules Bean, Creighton Hogg, Chuan-kai Lin, and Richard
   Smith.  Please let me know if I've forgotten to list you.
 
-Author:              Conal Elliott 
+Author:              Conal Elliott
 Maintainer:          conal@conal.net
 Homepage:            http://haskell.org/haskellwiki/reactive
 Package-Url:         http://code.haskell.org/reactive
+Bug-Reports:         http://trac.haskell.org/reactive
+
 Copyright:           (c) 2007-2008 by Conal Elliott
 Cabal-Version:       >= 1.2
-License:             BSD3
+License:             OtherLicense
+License-File:        COPYING
 Stability:           provisional
 Build-Type:          Simple
 Extra-Source-Files:
 Library
-    Build-Depends:       base, old-time, random, QuickCheck,
+    Build-Depends:       base, old-time, random, QuickCheck >= 2,
                          TypeCompose>=0.6.3, vector-space>=0.5,
-                         unamb>=0.1.5, checkers >= 0.1.3,
-                         category-extras >= 0.53.5, Stream
+                         unamb>=0.1.5, checkers >= 0.2,
+                         category-extras >= 0.53.5, Stream >= 0.3.1
     -- This library uses the ImpredicativeTypes flag, and it depends
     -- on vector-space, which needs ghc >= 6.9
     if impl(ghc < 6.9) {
diff --git a/src/Data/AddBounds.hs b/src/Data/AddBounds.hs
--- a/src/Data/AddBounds.hs
+++ b/src/Data/AddBounds.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  Data.AddBounds
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -124,13 +124,23 @@
      _         `max'` MinBound  = undefined
 
 
+-- instance Arbitrary a => Arbitrary (AddBounds a) where
+--   arbitrary = frequency [ (1 ,pure MinBound)
+--                         , (10, NoBound <$> arbitrary)
+--                         , (1 ,pure MaxBound) ]
+--   coarbitrary MinBound    = variant 0
+--   coarbitrary (NoBound a) = variant 1 . coarbitrary a
+--   coarbitrary MaxBound    = variant 2
+
 instance Arbitrary a => Arbitrary (AddBounds a) where
   arbitrary = frequency [ (1 ,pure MinBound)
                         , (10, NoBound <$> arbitrary)
                         , (1 ,pure MaxBound) ]
-  coarbitrary MinBound    = variant 0
-  coarbitrary (NoBound a) = variant 1 . coarbitrary a
-  coarbitrary MaxBound    = variant 2
+
+instance CoArbitrary a => CoArbitrary (AddBounds a) where
+  coarbitrary MinBound    = variant (0::Int)
+  coarbitrary (NoBound a) = variant (1::Int) . coarbitrary a
+  coarbitrary MaxBound    = variant (2::Int)
 
 instance (EqProp a, Eq a) => EqProp (AddBounds a) where
   NoBound a =-= NoBound b = a =-= b
diff --git a/src/Data/Max.hs b/src/Data/Max.hs
--- a/src/Data/Max.hs
+++ b/src/Data/Max.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  Data.Max
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -17,13 +17,13 @@
 
 import Data.Monoid (Monoid(..))
 
-import Test.QuickCheck (Arbitrary)
+import Test.QuickCheck (Arbitrary, CoArbitrary)
 import Test.QuickCheck.Checkers (EqProp)
 
 
 -- | Ordered monoid under 'max'.
 newtype Max a = Max { getMax :: a }
-	deriving (Eq, Ord, Bounded, Read, Show, EqProp, Arbitrary)
+	deriving (Eq, Ord, Bounded, Read, Show, EqProp, Arbitrary, CoArbitrary)
 
 instance (Ord a, Bounded a) => Monoid (Max a) where
 	mempty = Max minBound
diff --git a/src/Data/Min.hs b/src/Data/Min.hs
--- a/src/Data/Min.hs
+++ b/src/Data/Min.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  Data.Min
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/Data/PairMonad.hs b/src/Data/PairMonad.hs
--- a/src/Data/PairMonad.hs
+++ b/src/Data/PairMonad.hs
@@ -3,7 +3,7 @@
 -- |
 -- Module      :  Data.PairMonad
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive.hs b/src/FRP/Reactive.hs
--- a/src/FRP/Reactive.hs
+++ b/src/FRP/Reactive.hs
@@ -3,7 +3,7 @@
 -- |
 -- Module      :  FRP.Reactive
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Behavior.hs b/src/FRP/Reactive/Behavior.hs
--- a/src/FRP/Reactive/Behavior.hs
+++ b/src/FRP/Reactive/Behavior.hs
@@ -7,7 +7,7 @@
 -- |
 -- Module      :  FRP.Reactive.Behavior
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Fun.hs b/src/FRP/Reactive/Fun.hs
--- a/src/FRP/Reactive/Fun.hs
+++ b/src/FRP/Reactive/Fun.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Fun
 -- Copyright   :  (c) Conal Elliott 2007
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -50,10 +50,12 @@
 fun :: (t -> a) -> Fun t a
 fun = Fun
 
-instance (Arbitrary a,Arbitrary b) => Arbitrary (Fun a b) where
+instance (CoArbitrary a,Arbitrary b) => Arbitrary (Fun a b) where
   arbitrary = oneof [liftA K arbitrary, liftA Fun arbitrary]
-  coarbitrary (K a)   = variant 0 . coarbitrary a
-  coarbitrary (Fun x) = variant 1 . coarbitrary x
+
+instance (Arbitrary a, CoArbitrary b) => CoArbitrary (Fun a b) where
+  coarbitrary (K a)   = variant (0 :: Int) . coarbitrary a
+  coarbitrary (Fun x) = variant (1 :: Int) . coarbitrary x
 
 instance Show b => Show (Fun a b) where
   show (K x)   = "K " ++ show x
diff --git a/src/FRP/Reactive/Future.hs b/src/FRP/Reactive/Future.hs
--- a/src/FRP/Reactive/Future.hs
+++ b/src/FRP/Reactive/Future.hs
@@ -5,7 +5,7 @@
 -- |
 -- Module      :  FRP.Reactive.Future
 -- Copyright   :  (c) Conal Elliott 2007-2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Improving.hs b/src/FRP/Reactive/Improving.hs
--- a/src/FRP/Reactive/Improving.hs
+++ b/src/FRP/Reactive/Improving.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Improving
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -25,7 +25,7 @@
 
 import Data.Unamb (unamb,parCommute,pmin,pmax)
 
-import Test.QuickCheck hiding (evaluate)
+import Test.QuickCheck
 -- import Test.QuickCheck.Instances
 import Test.QuickCheck.Checkers
 import Test.QuickCheck.Classes
@@ -164,8 +164,11 @@
 
 -- For now, generate exactly-knowable values.
 -- TODO: generate trickier improving values.
+
 instance (Ord a, Arbitrary a) => Arbitrary (Improving a) where
   arbitrary   = exactly <$> arbitrary
+
+instance (CoArbitrary a) => CoArbitrary (Improving a) where
   coarbitrary = coarbitrary . exact
 
 instance Model (Improving a) a where model = exact
diff --git a/src/FRP/Reactive/Internal/Behavior.hs b/src/FRP/Reactive/Internal/Behavior.hs
--- a/src/FRP/Reactive/Internal/Behavior.hs
+++ b/src/FRP/Reactive/Internal/Behavior.hs
@@ -5,7 +5,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Behavior
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Clock.hs b/src/FRP/Reactive/Internal/Clock.hs
--- a/src/FRP/Reactive/Internal/Clock.hs
+++ b/src/FRP/Reactive/Internal/Clock.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Clock
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Fun.hs b/src/FRP/Reactive/Internal/Fun.hs
--- a/src/FRP/Reactive/Internal/Fun.hs
+++ b/src/FRP/Reactive/Internal/Fun.hs
@@ -3,7 +3,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Fun
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Future.hs b/src/FRP/Reactive/Internal/Future.hs
--- a/src/FRP/Reactive/Internal/Future.hs
+++ b/src/FRP/Reactive/Internal/Future.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Future
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -44,7 +44,8 @@
 -- time\/value pair.  Particularly useful with time types that have
 -- non-flat structure.
 newtype FutureG t a = Future { unFuture :: (Time t, a) }
-  deriving (Functor, Applicative, Monad, Copointed, Comonad {-, Show-},  Arbitrary)
+  deriving (Functor, Applicative, Monad, Copointed, Comonad {-, Show-}
+           , Arbitrary, CoArbitrary)
 
 isNeverF :: (Bounded t, Eq t) => FutureG t t1 -> Bool
 isNeverF (Future (t,_)) = t == maxBound
diff --git a/src/FRP/Reactive/Internal/IVar.hs b/src/FRP/Reactive/Internal/IVar.hs
--- a/src/FRP/Reactive/Internal/IVar.hs
+++ b/src/FRP/Reactive/Internal/IVar.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.IVar
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Misc.hs b/src/FRP/Reactive/Internal/Misc.hs
--- a/src/FRP/Reactive/Internal/Misc.hs
+++ b/src/FRP/Reactive/Internal/Misc.hs
@@ -2,7 +2,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Misc
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Reactive.hs b/src/FRP/Reactive/Internal/Reactive.hs
--- a/src/FRP/Reactive/Internal/Reactive.hs
+++ b/src/FRP/Reactive/Internal/Reactive.hs
@@ -5,7 +5,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Reactive
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Serial.hs b/src/FRP/Reactive/Internal/Serial.hs
--- a/src/FRP/Reactive/Internal/Serial.hs
+++ b/src/FRP/Reactive/Internal/Serial.hs
@@ -7,7 +7,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Serial
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/TVal.hs b/src/FRP/Reactive/Internal/TVal.hs
--- a/src/FRP/Reactive/Internal/TVal.hs
+++ b/src/FRP/Reactive/Internal/TVal.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.TVal
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Internal/Timing.hs b/src/FRP/Reactive/Internal/Timing.hs
--- a/src/FRP/Reactive/Internal/Timing.hs
+++ b/src/FRP/Reactive/Internal/Timing.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Internal.Timing
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/LegacyAdapters.hs b/src/FRP/Reactive/LegacyAdapters.hs
--- a/src/FRP/Reactive/LegacyAdapters.hs
+++ b/src/FRP/Reactive/LegacyAdapters.hs
@@ -3,7 +3,7 @@
 -- |
 -- Module      :  FRP.Reactive.LegacyAdapters
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/Num.hs b/src/FRP/Reactive/Num.hs
--- a/src/FRP/Reactive/Num.hs
+++ b/src/FRP/Reactive/Num.hs
@@ -4,7 +4,7 @@
 -- |
 -- Module      :  FRP.Reactive.Num
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/FRP/Reactive/PrimReactive.hs b/src/FRP/Reactive/PrimReactive.hs
--- a/src/FRP/Reactive/PrimReactive.hs
+++ b/src/FRP/Reactive/PrimReactive.hs
@@ -11,7 +11,7 @@
 -- |
 -- Module      :  FRP.Reactive.PrimReactive
 -- Copyright   :  (c) Conal Elliott 2007
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
@@ -78,7 +78,7 @@
 
 import Control.Comonad
 
-import Test.QuickCheck hiding (evaluate)
+import Test.QuickCheck
 import Test.QuickCheck.Instances
 import Test.QuickCheck.Checkers
 import Test.QuickCheck.Classes
@@ -129,13 +129,22 @@
 
 instance (Arbitrary t, Ord t, Bounded t, Num t, Arbitrary a) => Arbitrary (EventG t a) where
   arbitrary   = arbitraryE
+
+instance (CoArbitrary t, CoArbitrary a) => CoArbitrary (EventG t a) where
   coarbitrary = coarbitrary . eFuture
 
 ----
 
 -- Arbitrary works just like pairs:
+
+-- instance (Arbitrary t, Arbitrary a, Num t, Ord t, Bounded t) => Arbitrary (ReactiveG t a) where
+--   arbitrary = liftA2 Stepper arbitrary arbitrary
+--   coarbitrary (a `Stepper` e) = coarbitrary e . coarbitrary a
+
 instance (Arbitrary t, Arbitrary a, Num t, Ord t, Bounded t) => Arbitrary (ReactiveG t a) where
   arbitrary = liftA2 Stepper arbitrary arbitrary
+
+instance (CoArbitrary t, CoArbitrary a) => CoArbitrary (ReactiveG t a) where
   coarbitrary (a `Stepper` e) = coarbitrary e . coarbitrary a
 
 instance (Ord t, Bounded t) => Model (ReactiveG t a) (t -> a) where
diff --git a/src/FRP/Reactive/Reactive.hs b/src/FRP/Reactive/Reactive.hs
--- a/src/FRP/Reactive/Reactive.hs
+++ b/src/FRP/Reactive/Reactive.hs
@@ -6,7 +6,7 @@
 -- |
 -- Module      :  FRP.Reactive.Reactive
 -- Copyright   :  (c) Conal Elliott 2008
--- License     :  BSD3
+-- License     :  GNU AGPLv3 (see COPYING)
 -- 
 -- Maintainer  :  conal@conal.net
 -- Stability   :  experimental
diff --git a/src/Test.hs b/src/Test.hs
--- a/src/Test.hs
+++ b/src/Test.hs
@@ -1,3 +1,3 @@
--- Run tests.  ghc --make Test.hs -o test ; ./test
+-- Run tests.  ghc --make Test.hs -o test -threaded ; ./test
 
 import Test.Reactive