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-rw-r--r--testsuite/tests/deSugar/should_compile/ds047.hs9
1 files changed, 9 insertions, 0 deletions
diff --git a/testsuite/tests/deSugar/should_compile/ds047.hs b/testsuite/tests/deSugar/should_compile/ds047.hs
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+++ b/testsuite/tests/deSugar/should_compile/ds047.hs
@@ -0,0 +1,9 @@
+-- !!! Nullary rec-pats for constructors that hasn't got any labelled
+-- !!! fields is legal Haskell, and requires extra care in the desugarer.
+module ShouldCompile where
+
+data X = X Int [Int]
+
+f :: X -> Int
+f (X _ []) = 0
+f X{} = 1