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-rw-r--r--compiler/GHC/Platform/Reg.hs4
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/GHC/Platform/Reg.hs b/compiler/GHC/Platform/Reg.hs
index 8b4757744b..3b160f467e 100644
--- a/compiler/GHC/Platform/Reg.hs
+++ b/compiler/GHC/Platform/Reg.hs
@@ -142,8 +142,8 @@ getHiVRegFromLo reg
-- the usual way. We know what class they are, because that's part of
-- the processor's architecture.
--
-data RealReg
- = RealRegSingle {-# UNPACK #-} !RegNo
+newtype RealReg
+ = RealRegSingle RegNo
deriving (Eq, Show, Ord)
instance Uniquable RealReg where