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diff --git a/testsuite/tests/codeGen/should_compile/2578.hs b/testsuite/tests/codeGen/should_compile/2578.hs
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+++ b/testsuite/tests/codeGen/should_compile/2578.hs
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+
+{-# LANGUAGE EmptyDataDecls #-}
+
+-- This used to give warnings:
+-- ld: atom sorting error for _Main_MyType_closure_tbl and _Main_MyType2_closure_tbl in q.o
+-- ld: atom sorting error for _Main_MyType_closure_tbl and _Main_MyType2_closure_tbl in q.o
+-- ld: atom sorting error for _Main_MyType_closure_tbl and _Main_MyType2_closure_tbl in q.o
+-- when compiling on OS X (trac #2578).
+
+module Main (main) where
+
+data MyType
+data MyType2
+
+main :: IO ()
+main = print ()
+