[commit: ghc] master: Fix the GHC 7.10 build (f5bea98)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/f5bea9820eb5d573718d9a5e82c3f5acd7dbb734/ghc

>---------------------------------------------------------------

commit f5bea9820eb5d573718d9a5e82c3f5acd7dbb734
Author: Ryan Scott <ryan.gl.scott at gmail.com>
Date:   Thu Jan 19 14:43:25 2017 -0500

    Fix the GHC 7.10 build
    
    Following e7985ed23ddc68b6a2e4af753578dc1d9e8ab4c9. HasDebugCallStack now
    appears in IdInfo, which requires `FlexibleContexts` to be enabled when built
    with GHC 7.10.


>---------------------------------------------------------------

f5bea9820eb5d573718d9a5e82c3f5acd7dbb734
 compiler/basicTypes/IdInfo.hs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/basicTypes/IdInfo.hs b/compiler/basicTypes/IdInfo.hs
index 3c6727c..b364326 100644
--- a/compiler/basicTypes/IdInfo.hs
+++ b/compiler/basicTypes/IdInfo.hs
@@ -9,6 +9,7 @@ Haskell. [WDP 94/11])
 -}
 
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE FlexibleContexts #-}
 
 module IdInfo (
         -- * The IdDetails type