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Simon Marlow authored
Someone on IRC reported that they were encountering a strange missing module error from GHC, and it turned out that they had mtl-1.1.0.2 installed in both the global and local DB, with the same InstalledPackageId. The two packages should be interchangeable, but we were forgetting to eliminate duplicates in part of the package-processing phase in GHC. Really I should switch this code over to use the new PackageIndex data type in Cabal, which ought to make things simpler.
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