On Sat, Dec 17, 2016 at 02:28:12AM +0000, Andreas Reuleaux wrote: > doctest: Could not on-demand load symbol 'lenszm4zi14zm9dVzzUyOAXSjIX3UgJ3NnoU_ControlziLensziTH_makeLenses_closure' We'll need to rebuild doctest with ghc 8.0.1-17. If you want to ensure that the fix makes it into the release, file an RC bug against doctest.