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by JoshTriplett 4454 days ago
GHC 7.8 is already packaged in Debian experimental, so if you're running current testing, you may find it easiest to just add sources for experimental and sid, set the default release to testing (so you don't upgrade anything else), and then install GHC 7.8 directly. You'll end up upgrading a pile of Haskell packages to versions from experimental, but mostly not the rest of your system.