haskell/vector — pull request #3 by hvr (2013-11-03 11:21:20+00:00)
Title: Define Applicative instances for Box/Id

This silences GHC 7.8's AMP warning. See

http://www.haskell.org/haskellwiki/Functor-Applicative-Monad_Proposal#Future-proofing_current_code

for more details