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-rw-r--r--testsuite/tests/indexed-types/should_compile/T1981.hs8
1 files changed, 8 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_compile/T1981.hs b/testsuite/tests/indexed-types/should_compile/T1981.hs
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+++ b/testsuite/tests/indexed-types/should_compile/T1981.hs
@@ -0,0 +1,8 @@
+{-# OPTIONS_GHC -XTypeFamilies #-}
+
+module ShouldCompile where
+
+type family T a
+
+f :: T a -> Int
+f x = x `seq` 3