This is quite nasty, as it introduces a local copy of
bits of containers. I'll leave this one as in-discussion
for a few days to allow people to object.
1 patch for repository darcs-unstable@darcs.net:screened:
Tue Aug 20 06:45:21 BST 2013 Ganesh Sittampalam <ganesh@earth.li>
* Introduce a local copy of Data.Map.Strict from containers 0.5,
so we can build with containers 0.4
darcs builds fine with the -fuse-local-data-map-strict flag, so it seems
good to go in (when I push the other patience diff patches, which will
be very soon).