Building GHC master with GHC 7.6

Hello everyone, Earlier today I merged a clean-up [1] to the master branch which removed some #ifdefs which ensured that the tree could be built with GHC 7.6 Thomas Miedema correctly pointed out that some nightly builders may not be on GHC 7.8 yet. Do any of the nightly builders call in this category? If so, would it be possible to upgrade? Cheers, - Ben [1] https://phabricator.haskell.org/D904