[Haskell-cafe] Cabal hell (8.2.1,/Haskell Package/MacOS X)

[Stuart A. Kurtz]

Dear Cafe,

I've had my first extended visit into cabal hell...

ghc: 8.2.1 (Haskell Platform)
cabal: 2.0.0.2
cabal-install: 2.0.0.0
OS: MacOS X 10.13 (High Sierra)

I have problems around trying to install some standard packages: hlint, aeson. A typical error reported by cabal is

<command line>: cannot satisfy -package-id hashable-1.2.6.1-14fEJP30YhAG9w115PODz0: 
    hashable-1.2.6.1-14fEJP30YhAG9w115PODz0 is unusable due to shadowed dependencies:
      text-1.2.2.2-EGUst8sqNAZCw1xLPcmcMH

FWIW, the versions of these packages reported by ghc-pkg are

    hashable-1.2.6.1
    text-1.2.2.2

Suggestions welcome...

Peace,

Stu