[Haskell-cafe] Cabal try to install a package I already have

[Daniel Díaz Casanueva]

Indeed, it seems to be for parsec:

? ghc-pkg latest bytestring
bytestring-0.9.1.10

? ghc-pkg latest parsec
parsec-3.1.2

Haskell Platform versions: bytestring-0.9.1.10, parsec-3.1.1.
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