haskell-stack is marked for autoremoval from testing

[Debian testing autoremoval watch]

haskell-stack 1.1.2-7 is marked for autoremoval from testing on 2017-08-22

It (build-)depends on packages with these RC bugs:
867832: haskell-either: haskell-either build-depends libghc-monadrandom-dev (< 0.5) but 0.5.1-1 is to be installed
867876: haskell-http-api-data: haskell-http-api-data FTBFS: Duplicate instance declarations