For GHC, implement the Typeable.hs macros using standalone deriving

[ghc-base.git] / Data / Either.hs

diff --git a/Data/Either.hs b/Data/Either.hs
index 1c12897..b45609b 100644 (file)
--- a/Data/Either.hs
+++ b/Data/Either.hs
@@ -1,4 +1,7 @@
 {-# LANGUAGE CPP, NoImplicitPrelude #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
 
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