I replied on the GSoC proposal itself, but since it was cross-posted to the mailing list, I'll include my comments here too: I've reviewed this proposal, and I think it outlines a step in a good direction. As I've discussed with Duncan in the past, my biggest concern around a system like this is the complexity of the UI for a developer; having to juggle different environments just to get basic work done could be a significant hurdle. As long as attention is paid to ensuring no "UI regression" for simple cases, I think this is worth pursuing. On Tue, Mar 24, 2015 at 7:17 PM Vishal Agrawal 1 wrote:

I am already planning to do a GSoC project based on it with a slightly larger aim. You can find my work in progress proposal at https://gist.github.com/fugyk/37510958b52589737274. Also I have written a patch to make cabal non-destructive at https://github.com/fugyk/cabal/commit/45ec5edbaada1fd063c67d6109e69efa0e732e.... Can you review the proposal and give me suggestions.