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-rw-r--r--compiler/cmm/BlockId.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/cmm/BlockId.hs b/compiler/cmm/BlockId.hs
index 8a46aed8f0..e4cc0bccb7 100644
--- a/compiler/cmm/BlockId.hs
+++ b/compiler/cmm/BlockId.hs
@@ -1,5 +1,7 @@
-{- BlockId module should probably go away completely, being superseded by Label -}
+{-# LANGUAGE TypeSynonymInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+{- BlockId module should probably go away completely, being superseded by Label -}
module BlockId
( BlockId, mkBlockId -- ToDo: BlockId should be abstract, but it isn't yet
, BlockSet, BlockEnv