Re: [jhc] confusion on library source

On Sun, Aug 30, 2009 at 09:56:38AM -0400, David Roundy wrote:

On Sat, Aug 29, 2009 at 6:58 PM, John Meacham wrote:

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$ cat lib/haskell98/System.hs module System (     ExitCode(ExitSuccess,ExitFailure),     getArgs, getProgName, getEnv, system, exitWith, exitFailure   ) where

import System.Exit import System.Environment import System.Cmd

So it looks like System.Exit should exist somewhere.  But I can't for the life of me (or the grep of me...) figure out where.  :(  I had been thinking that adding System.Exit would be an easy way to contribute a bit towards jhc, and at the same time learn a bit about how jhc works.  Is System.Exit defined somewhere? If so, how can I convince jhc to use it in my code? I am very puzzled.

Ah, that is because the haskell98 package is the one pulled straight from the darcs repo that ghc uses. In jhc, System is provided by base, so is in lib/base/System.hs, the System provided by haskell98 is ignored.

Would it be feasible/desirable for me to split lib/base/System.hs into System.Exit, System.Environment and System.Cmd? It would make a few more of my programs more easily usable, and then we could use the System.hs from the haskell98 package. Thanks!

That would be quite useful. In general, the libraries need a lot of work. Compatibility with GHC where it makes sense is a useful thing. I am busy working on the back end and memory use of the generated code at the moment, but if someone out there wanted to help improve the libraries that would be great. Porting documentation to the jhc libs from the ghc repo would also be pretty straightforward and useful. John -- John Meacham - ⑆repetae.net⑆john⑈ - http://notanumber.net/