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-rw-r--r--testsuite/tests/deriving/should_run/T14918.hs18
-rw-r--r--testsuite/tests/deriving/should_run/T14918.stdout2
-rw-r--r--testsuite/tests/deriving/should_run/all.T1
3 files changed, 21 insertions, 0 deletions
diff --git a/testsuite/tests/deriving/should_run/T14918.hs b/testsuite/tests/deriving/should_run/T14918.hs
new file mode 100644
index 0000000000..2ad293724b
--- /dev/null
+++ b/testsuite/tests/deriving/should_run/T14918.hs
@@ -0,0 +1,18 @@
+{-# LANGUAGE MagicHash #-}
+module Main where
+
+data T a = MkT { runT :: a, (##) :: a } deriving (Read, Show)
+data T# a = MkT# { runT# :: a, (###) :: a } deriving (Read, Show)
+
+t1, t2 :: T Int
+t1 = MkT (-1) 1
+t2 = read $ show t1
+
+t1#, t2# :: T# Int
+t1# = MkT# (-1) 1
+t2# = read $ show t1#
+
+main :: IO ()
+main = do
+ print t2
+ print t2#
diff --git a/testsuite/tests/deriving/should_run/T14918.stdout b/testsuite/tests/deriving/should_run/T14918.stdout
new file mode 100644
index 0000000000..b85e2a219e
--- /dev/null
+++ b/testsuite/tests/deriving/should_run/T14918.stdout
@@ -0,0 +1,2 @@
+MkT {runT = -1, (##) = 1}
+MkT# {runT# = -1, (###) = 1}
diff --git a/testsuite/tests/deriving/should_run/all.T b/testsuite/tests/deriving/should_run/all.T
index c5605f627e..cf0cb922ed 100644
--- a/testsuite/tests/deriving/should_run/all.T
+++ b/testsuite/tests/deriving/should_run/all.T
@@ -45,3 +45,4 @@ test('T10598_bug', normal, compile_and_run, [''])
test('T10598_run', normal, compile_and_run, [''])
test('T11535', when(opsys('mingw32'), expect_broken_for(12210, ['ghci'])),
compile_and_run, [''])
+test('T14918', normal, compile_and_run, [''])