On Sat, Jul 09, 2016 at 11:00:41AM -0400, Edward Z. Yang wrote: > OK, well, you can still get the ABI of a package in all cases > (it's just not in the ID anymore.) Something like: > > ezyang@sabre:~$ ghc-pkg field base-4.9.0.0 abi > abi: 5e731f0a06895b09ada57a6853a117b3 That seems like exactly what we want.