So far I've only tested this by running the testsuite locally on a Linux machine.

I took much time to try using bytestring 0.11 but I cannot use it yet. So, I cannot test this PR at this moment, sigh.

I took much time to try using bytestring 0.11 but I cannot use it yet. So, I cannot test this PR at this moment, sigh.

Is your package list up-to-date? unix was made compatible only a few hours ago: haskell/unix#162 (comment)

After cabal update, I could successfully run cabal test --constraint 'bytestring >= 0.11'.

@kazu-yamamoto cabal test --constraint bytestring==0.11.0.0 works just fine for me. Or alternatively one can test with stack:

resolver: lts-12.24
packages:
- '.'
nix:
  packages: [ ncurses ]

# XXX workaround
# https://github.com/commercialhaskell/stack/issues/2245
hide-th-loading: false

extra-deps:
- bytestring-0.11.0.0
- directory-1.3.6.1
- unix-2.7.2.2
- hspec-2.7.4
- hspec-discover-2.7.4
- QuickCheck-2.14.2
- hspec-core-2.7.4
- random-1.2.0
- splitmix-0.1.0.3
allow-newer: true

Great! I made it!

Merged. Thank you for your contribution!

Should I modify the constraint of the current version in Hackage?

Yes, please. Thanks!

Done.