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diff --git a/testsuite/tests/indexed-types/should_compile/Simple19.hs b/testsuite/tests/indexed-types/should_compile/Simple19.hs
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+{-# LANGUAGE TypeFamilies, LiberalTypeSynonyms #-}
+ -- ^ crucial for exercising the code paths to be
+ -- tested here
+
+module ShouldCompile where
+
+type family Element c :: *
+
+f :: Element x
+f = undefined