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-rw-r--r--testsuite/tests/indexed-types/should_fail/NonLinearSigErr.hs8
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diff --git a/testsuite/tests/indexed-types/should_fail/NonLinearSigErr.hs b/testsuite/tests/indexed-types/should_fail/NonLinearSigErr.hs
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+++ b/testsuite/tests/indexed-types/should_fail/NonLinearSigErr.hs
@@ -0,0 +1,8 @@
+{-# LANGUAGE TypeFamilies #-}
+
+-- This is actually perfectly ok!
+
+module NonLinearSigErr where
+
+type family E a b
+type instance E a (a :: *) = [a]