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-rw-r--r--testsuite/tests/numeric/should_compile/T23019.hs21
-rw-r--r--testsuite/tests/numeric/should_compile/all.T1
2 files changed, 22 insertions, 0 deletions
diff --git a/testsuite/tests/numeric/should_compile/T23019.hs b/testsuite/tests/numeric/should_compile/T23019.hs
new file mode 100644
index 0000000000..6b3e3d92ba
--- /dev/null
+++ b/testsuite/tests/numeric/should_compile/T23019.hs
@@ -0,0 +1,21 @@
+module T23019
+ (
+ eexponent
+ ) where
+
+-- spine lazy, value strict list of doubles
+data List
+ = Nil
+ | {-# UNPACK #-} !Double :! List
+
+infixr 5 :!
+
+newtype TowerDouble = Tower { getTower :: List }
+
+primal :: TowerDouble -> Double
+primal (Tower (x:!_)) = x
+primal _ = 0
+
+eexponent :: TowerDouble -> Int
+eexponent = exponent . primal
+
diff --git a/testsuite/tests/numeric/should_compile/all.T b/testsuite/tests/numeric/should_compile/all.T
index 0c22811cc8..6f55e3b2fd 100644
--- a/testsuite/tests/numeric/should_compile/all.T
+++ b/testsuite/tests/numeric/should_compile/all.T
@@ -19,3 +19,4 @@ test('T20347', normal, compile, ['-ddump-simpl -O -dsuppress-all -dno-typeable-b
test('T20448', normal, compile, ['-ddump-simpl -O -dsuppress-all -dno-typeable-binds -dsuppress-uniques'])
test('T19641', normal, compile, ['-ddump-simpl -O -dsuppress-all -dno-typeable-binds -dsuppress-uniques'])
test('T15547', normal, compile, ['-ddump-simpl -O -dsuppress-all -dno-typeable-binds -dsuppress-uniques'])
+test('T23019', normal, compile, ['-O'])