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diff --git a/testsuite/tests/rename/should_fail/rnfail015.hs b/testsuite/tests/rename/should_fail/rnfail015.hs
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+++ b/testsuite/tests/rename/should_fail/rnfail015.hs
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+module ShouldFail where
+
+-- !!! duplicate constructors in datatype
+-- (bug report from Alex Ferguson, c. 2.06)
+
+data Token
+ = TokNewline
+ | TokLiteral
+ | TokCount
+ | TokCheck
+ | TokIs
+ | TokDeref
+ | TokFind
+ | TokLiteral -- Duplicated!
+ | TokThe
+
+ deriving Show
+
+main = print TokCount
+