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diff --git a/testsuite/tests/simplCore/should_compile/T16373.hs b/testsuite/tests/simplCore/should_compile/T16373.hs
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+{-# LANGUAGE DataKinds #-}
+{-# OPTIONS_GHC -ddump-simpl -dsuppress-all -dno-typeable-binds -O2 #-}
+
+module Test2 where
+
+import GHC.TypeLits
+import Data.Proxy
+
+testAA :: Bool
+testAA = symbolVal (Proxy :: Proxy "A") == symbolVal (Proxy :: Proxy "A")
+
+testAB :: Bool
+testAB = symbolVal (Proxy :: Proxy "A") == symbolVal (Proxy :: Proxy "B")