Can't build current HEAD

[David Luposchainsky]

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On 13.11.2015 19:00, Jan Stolarek wrote:
> I am unable to build current HEAD. I'm getting a build error in Outputable 
> module

I just ran into this myself. The ">= 710" is wrong, since 7.10 does not have
CallStack yet. Changing it to "> 710" lets you compile GHC again, at the cost
of a redundant import warning.

David/quchen

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