From: Ian Lynagh <igloo@earth.li>
Date: Tue, 24 May 2011 17:06:50 +0000 (+0100)
Subject: Disable DatatypeContexts by default
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=18a0ead12b605fd20c13f5255d78cfbf699fe0c4;hp=c7e3cba25cbb0c50e27ca1df4ef71cf3556a492c

Disable DatatypeContexts by default

The Haskell' committee decided to remove datatype contexts from the language:
http://www.haskell.org/pipermail/haskell-prime/2011-January/003335.html
---

diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index 69185db..6e8a341 100644
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -874,7 +874,11 @@ languageExtensions Nothing
       -- But NB it's implied by GADTs etc
       -- SLPJ September 2010
     : Opt_NondecreasingIndentation -- This has been on by default for some time
-    : languageExtensions (Just Haskell2010)
+    : delete Opt_DatatypeContexts  -- The Haskell' committee decided to
+                                   -- remove datatype contexts from the
+                                   -- language:
+   -- http://www.haskell.org/pipermail/haskell-prime/2011-January/003335.html
+      (languageExtensions (Just Haskell2010))
 
 languageExtensions (Just Haskell98)
     = [Opt_ImplicitPrelude,