ANNOUNCE: GHC 7.10.1 Release Candidate 1 - problem with latest cabal-install

[Edward Z. Yang]

If you still have your old GHC around, it will be much better to
compile the newest cabal-install using the *old GHC*, and then
use that copy to bootstrap a copy of the newest cabal-install.

Edward

Excerpts from George Colpitts's message of 2015-01-01 12:08:44 -0500:
> ​$ ​
> cabal update
> Downloading the latest package list from hackage.haskell.org
> Note: *there is a new version of cabal-install available.*
> To upgrade, run: cabal install cabal-install
> bash-3.2$ *cabal install -j3 cabal-install *
> *​...​*
> 
> 
> *Resolving dependencies...cabal: Could not resolve dependencies:*
> trying: cabal-install-1.20.0.6 (user goal)
> trying: base-4.8.0.0/installed-779... (dependency of cabal-install-1.20.0.6)
> next goal: process (dependency of cabal-install-1.20.0.6)
> rejecting: process-1.2.1.0/installed-2db... (conflict: unix==2.7.1.0,
> process
> => unix==2.7.1.0/installed-4ae...)
> trying: process-1.2.1.0
> next goal: directory (dependency of cabal-install-1.20.0.6)
> rejecting: directory-1.2.1.1/installed-b08... (conflict: directory =>
> time==1.5.0.1/installed-c23..., cabal-install => time>=1.1 && <1.5)
> rejecting: directory-1.2.1.0 (conflict: base==4.8.0.0/installed-779...,
> directory => base>=4.5 && <4.8)
> rejecting: directory-1.2.0.1, 1.2.0.0 (conflict:
> base==4.8.0.0/installed-779..., directory => base>=4.2 && <4.7)
> rejecting: directory-1.1.0.2 (conflict: base==4.8.0.0/installed-779...,
> directory => base>=4.2 && <4.6)
> rejecting: directory-1.1.0.1 (conflict: base==4.8.0.0/installed-779...,
> directory => base>=4.2 && <4.5)
> rejecting: directory-1.1.0.0 (conflict: base==4.8.0.0/installed-779...,
> directory => base>=4.2 && <4.4)
> rejecting: directory-1.0.1.2, 1.0.1.1, 1.0.1.0, 1.0.0.3, 1.0.0.0 (conflict:
> process => directory>=1.1 && <1.3)
> Dependency tree exhaustively searched.