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-rw-r--r--testsuite/tests/indexed-types/should_compile/Simple11.hs16
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_compile/Simple11.hs b/testsuite/tests/indexed-types/should_compile/Simple11.hs
new file mode 100644
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+++ b/testsuite/tests/indexed-types/should_compile/Simple11.hs
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+{-# LANGUAGE TypeFamilies #-}
+
+module Simple11 where
+
+type family F a
+
+same :: a -> a -> a
+same = undefined
+
+mkf :: a -> F a
+mkf p = undefined
+
+-- Works with explicit signature
+-- foo :: a -> a -> (F a, a)
+foo p q = same (mkf p, p) (mkf q, q)
+