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diff --git a/compiler/GHC/Cmm/BlockId.hs-boot b/compiler/GHC/Cmm/BlockId.hs-boot
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+module GHC.Cmm.BlockId (BlockId, mkBlockId) where
+
+import GHC.Cmm.Dataflow.Label (Label)
+import Unique (Unique)
+
+type BlockId = Label
+
+mkBlockId :: Unique -> BlockId