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-rw-r--r--testsuite/tests/indexed-types/should_compile/T3826.hs15
1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_compile/T3826.hs b/testsuite/tests/indexed-types/should_compile/T3826.hs
new file mode 100644
index 0000000000..39c597f69c
--- /dev/null
+++ b/testsuite/tests/indexed-types/should_compile/T3826.hs
@@ -0,0 +1,15 @@
+{-# LANGUAGE TypeFamilies #-}
+
+module T3826 where
+
+class C a where
+ type E a
+ c :: E a -> a -> a
+
+data T a = T a
+
+instance C (T a) where
+ type E (T a) = a
+ c x (T _) = T x
+
+f t@(T x) = c x t