[Nix-dev] Getting mueval working again

[Richard Wallace]

mueval used to work via a wrapper, so that the GHC_PACKAGE_PATH would be
set correctly. This is no longer the case, and I'm having trouble figuring
out how to get it working again.

I've tried setting the GHC_PACKAGE_PATH to $NIX_GHC_LIBDIR/package.conf.d,
but I still get the same error:

    $ mueval -E -T -e 'id'
    mueval-core: GHC returned a result but said: [GhcError {errMsg = "Top
level:\n    Module \8216Control.Monad.Error\8217 is deprecated:\n      Use
Control.Monad.Except instead"}]

Any ideas?

Thanks,
Rich
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