Proposal: overhaul System.Process

[Duncan Coutts]

On Tue, 2008-04-22 at 15:45 -0700, Simon Marlow wrote:

> > What happens to stderr with this function, by the way?
> >  Is it tied to stdout (probably the right thing to do), or to /dev/null,
> > or is it closed (eek!)?  
> 
> None of the above :)  Currently it's inherited from the parent. 
> Unfortunately it's not easy to tie stderr and stdout to the same pipe - 
> createProcess can't do that, and readProcess is defined in terms of it.

I don't understand the restriction. What if we just pass stdout as the
handle to use for stdout and stderr. The types say that's possible, so
what would go wrong?

Duncan