FYI: Builds, test and benchmarks work OK on OS X (Sierra) with stack-1.6.1 and ghc-8.2.2

[sebeaumont]

All test and benchmarks run with my very relaxed stack.yaml (see below).

The following allow-newer bumps resulted:

WARNING: Ignoring out of range dependency (allow-newer enabled): criterion-1.2.6.0. grenade requires: ==1.1.*
WARNING: Ignoring out of range dependency (allow-newer enabled): optparse-applicative-0.14.0.0. grenade-examples requires: ==0.13.*

stack.yaml

system-ghc: true
resolver: nightly-2017-12-14
compiler-check: newer-minor
allow-newer: true

packages:
  - .
  - examples

[HuwCampbell]

Ta, have bumped optparse in the examples.