[Haskell-cafe] extension to filter with external program (was: Current status of Mavericks CPP)

[Tom Ellis]

On Wed, Apr 16, 2014 at 01:29:23PM +0200, Tobias Florek wrote:
> i'd like to have (instead of LANGUAGE CPP) the following extension.
> 
> LANGUAGE FilterWithExternalProgram my_cpp

I really don't want LANGUAGE pragmas running arbitrary programs on my
computer.  Regrettably there are already ways to get GHC to do this, but the
fewer the better, in my opinion.

Tom