Send output of building Setup.hs to stderr #1410
Description
Its usage of runIn causes it to inherit stdout and stderr. For example, here's some integration test output for a failing case:
uncaught exception: TestFailure (Exited with ExitFailure 1
stdout:
[1 of 1] Compiling Main ( /tmp/stack31370/Setup.hs, /tmp/stack31370/Setup.o )
Linking /tmp/stack-integration-home31337/.stack/setup-exe-cache/tmp-setup-Simple-Cabal-1.22.4.0-x86_64-linux-ghc-7.10.2 ...
stderr:
Running: /home/mgsloan/fpco/stack/.stack-work/install/x86_64-linux/lts-3.14/7.10.2/bin/stack build
Downloading lts-3.9 build plan ...
Downloaded lts-3.9 build plan.
Caching build plan