1 files changed, 20 insertions, 0 deletions
diff --git a/testsuite/tests/deSugar/should_compile/GadtOverlap.hs b/testsuite/tests/deSugar/should_compile/GadtOverlap.hs
new file mode 100644
index 0000000000..89187414a3
--- /dev/null
+++ b/testsuite/tests/deSugar/should_compile/GadtOverlap.hs
@@ -0,0 +1,20 @@
+{-# LANGUAGE GADTs #-}
+
+module Gadt where
+
+data T a where
+   T1 :: T Int
+   T2 :: T a
+   T3 :: T Bool
+
+f :: T Int -> Bool
+f T1 = True
+f T2 = False
+
+g :: T Bool -> Bool
+g T2 = True
+g T3 = False
+
+h :: T a -> Bool
+h T1 = True
+h T2 = False