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diff --git a/ghc/compiler/tests/deSugar/ds005.hs b/ghc/compiler/tests/deSugar/ds005.hs
new file mode 100644
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+++ b/ghc/compiler/tests/deSugar/ds005.hs
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+--!!! ds005 -- mappairs from SLPJ Ch 5'
+--
+-- this simply tests a "typical" example
+
+module MapPairs where
+
+-- from SLPJ, p 78
+mappairs f []     ys     = []
+mappairs f (x:xs) []     = []
+mappairs f (x:xs) (y:ys) = f x y : mappairs f xs ys
+
+-- from p 80
+mappairs' f []     ys     = []
+mappairs' f x      []     = []
+mappairs' f (x:xs) (y:ys) = f x y : mappairs' f xs ys