Improve System.Environment haddocks

[Simon Marlow]

On 23/01/2012 20:19, Gwern Branwen wrote:
> On Fri, Dec 23, 2011 at 9:16 PM, Gwern Branwen<gwern0 at gmail.com>  wrote:
>> On Sun, Nov 27, 2011 at 6:11 PM, Gwern Branwen<gwern0 at gmail.com>  wrote:
>>> 17:52:34<  goodgrue>  Is there a way to change the environment
>>> variables associated with Xmonad.Prompt.Shell at runtime?  e.g. I'd
>>> like to be able to modify $http_proxy and have that affect
>>> subsequently launched processes.
>>> 17:55:31<  gwern>  goodgrue: that'd be kind of hard. you could prepend
>>> a mpodification of $HTTP_PROXY to each command
>>> 17:56:10<  gwern>  ideally you'd modify xmonad's own environment
>>> 17:56:33<  goodgrue>  gwern: yeah, the latter is what I was thinking
>>> of. is that possible?
>>> 17:57:08<  gwern>  shell uses `getEnv` from System.Environment but
>>> there's no setEnv!
>>> 17:57:21<  gwern>  if there were, you could probably bind it to a key
>>> and use a prompt
>>> 17:58:44<  goodgrue>  Hm...sounds like this may be a nice piece of
>>> missing functionality. is there any reason you can think of that i
>>> wouldn't be able to implement setEnv myself?
>>> 17:59:04<  gwern>  http://hackage.haskell.org/trac/ghc/ticket/3587
>>> 17:59:14<  gwern>  looks like 'putEnv' may be the real name
>>
>> Ping. This was a very simple patch; am I really going to have to file
>> a bug and everything?
>
> No objections to this doc fix yet...

Sorry for the delay, I'll push it shortly.

Cheers,
	Simon