Test GHC 8.2.1-rc2 with Stack. https://mail.haskell.org/pipermail/ghc-devs/2017-May/014197.html

stack.yaml

compiler: ghc-8.2.0.20170507
compiler-check: match-exact
resolver: lts-8.13
setup-info:
  ghc:
    linux64:
      8.2.0.20170507:
        url: https://downloads.haskell.org/~ghc/8.2.1-rc2/ghc-8.2.0.20170507-x86_64-deb8-linux.tar.xz
        content-length: 141011788
        sha1: ff886437c1d2ddfa5686d6c9efb0819a957c3dde
    macosx:
      8.2.0.20170507:
        url: https://downloads.haskell.org/~ghc/8.2.1-rc2/ghc-8.2.0.20170507-x86_64-apple-darwin.tar.xz
        content-length: 126192308
        sha1: f059fe6f8a898d5619ab03e06e0ff0912a5f3340
    windows64:
      8.2.0.20170507:
        url: https://downloads.haskell.org/~ghc/8.2.1-rc2/ghc-8.2.0.20170507-x86_64-unknown-mingw32.tar.xz
        content-length: 177295548
        sha1: 87646ca3a89278775ceb7be429faafac3cf738d8