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diff --git a/testsuite/tests/deSugar/should_run/mc06.hs b/testsuite/tests/deSugar/should_run/mc06.hs
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+-- Test grouping with both a using and a by clause
+
+{-# OPTIONS_GHC -XMonadComprehensions -XTransformListComp #-}
+
+module Main where
+
+import Data.List(groupBy)
+import GHC.Exts(the)
+
+groupRuns :: Eq b => (a -> b) -> [a] -> [[a]]
+groupRuns f = groupBy (\x y -> f x == f y)
+
+main = putStrLn (show output)
+  where
+    output = [ (the x, product y)
+             | x <- ([1, 1, 1, 2, 2, 1, 3])
+             , y <- [4..6]
+             , then group by x using groupRuns ]