[project @ 1999-07-31 18:43:48 by sof]

nullary recpat reg. test

diff --git a/ghc/tests/deSugar/should_compile/ds047.hs b/ghc/tests/deSugar/should_compile/ds047.hs
new file mode 100644 (file)
index 0000000..90078e0
--- /dev/null
+++ b/ghc/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 Test where
+
+data X = X Int [Int]
+
+f :: X -> Int
+f (X _ []) = 0
+f X{}      = 1