I pasted your report into the bug tracker: https://github.com/haskell/cabal/issues/1478 I don't know if you're on GitHub or not so I could link the report to your user. On Thu, Sep 5, 2013 at 8:16 AM, Rogan Creswick wrote:

I ran into another oddity due to old build artifacts today -- it was easy to fix, but very confusing; cabal repl was exiting with "unrecognised command: repl".

tl/dr; if you see this, delete the old 'dist' dir and re-run 'cabal configure'.

Here's a snippit of my shell session to explain in more detail:

$ cabal sandbox init ... $ cabal --version cabal-install version 1.18.0 using version 1.18.0 of the Cabal library $ cabal configure Resolving dependencies... Configuring pgftransform-0.0.0.1... $ cabal repl unrecognised command: repl (try --help) $ cabal --help ... Commands: ... build Compile all targets or specific targets. repl Open an interpreter session for the given target. sandbox Create/modify/delete a sandbox. ...

Note that cabal --version and cabal --help indicated that repl /was/ a valid command.

The issue appears to be that an old dist directory was still hanging around, and (I suspect) the compiled setup.hs build program (which would have been built with an old Cabal) was causing the actual error. Deleting the dist dir and re-running cabal configure set everything right.

--Rogan

On Thu, Sep 5, 2013 at 6:18 AM, Yuri de Wit wrote:

...

It is easy enough to recreate the link manually or as easy to run cabal install again, but that is not the point here. The point is that it will bite the next dozen of unsuspecting users since, at first, they have no idea of what is going on.

In any case, apologies for sending this in this thread as it doesn't seem the right forum to discuss it.

On Thu, Sep 5, 2013 at 7:53 AM, Paolo Giarrusso wrote:

...

On Wednesday, September 4, 2013 11:41:33 PM UTC+2, Yuri de Wit wrote:

...

Thanks for all the hard work!

If you see this in OSX (#1009) while installing cabal 1.18:

Warning: could not create a symlink in /Users/lemao/Library/Haskell/bin for cabal because the file exists there already but is not managed by cabal. You can create a symlink for this executable manually if you wish. The executable file has been installed at /Users/user/Library/Haskell/ghc-7.6.3/lib/cabal-install-1.18.0/bin/cabal

You will need to manually remove the pre-existing 1.16 links in ~/Library/Haskell/bin before installing again.

Instead of installing again, you can even just recreate the symlink as mentioned by the message (if you know how to do that).

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