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-rw-r--r--pkgs/top-level/haskell-defaults.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index ed97281b9bdb1..b29635e0ac9c8 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -52,6 +52,7 @@
       cabalInstall = self.cabalInstall_0_14_0.override { Cabal = self.Cabal_1_14_0; };
       cabal2nix = self.cabal2nix.override { Cabal = self.Cabal_1_16_0_3; hackageDb = self.hackageDb.override { Cabal = self.Cabal_1_16_0_3; }; };
       binary = self.binary_0_6_0_0;
+      prettyShow = self.prettyShow_1_2;
     };
 
   ghc721Prefs = ghc722Prefs;