Say ghc provids process-old, and Cabal-old depends on it. Then I use --upgrade-dependencies to install somePackage and so install process-new in user space. The process-old is still there. Why Cabal-old breaks and `ghc-pkg check` gets nothing?

On Wed, Nov 21, 2012 at 8:47 AM, Albert Y. C. Lai <trebla@vex.net> wrote:

On 12-11-19 09:39 PM, Magicloud Magiclouds wrote:

And, the key point is that using upgrade-dependencies with
cabal-install. I am using git (current) version of cabal-install.
Without that argument, things could be fine. With it, it must fail.

Therefore, don't use upgrade-dependencies.

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