Test suite failure with hspec 2.5

[DanBurton]

> /tmp/stackage-build12/pipes-misc-0.4.0.1$ dist/build/pipes-misc-test/pipes-misc-test

Misc
  Buffered
  Locally +10 to second
pipes-misc-test: thread blocked indefinitely in an MVar operation

I was able to reproduce this like so:

stack unpack pipes-misc-0.4.0.1 && cd pipes-misc-0.4.0.1
edit stack.yaml # add the following stack.yaml
stack test

# stack.yaml
resolver: nightly-2018-03-18
extra-deps:
- Decimal-0.5.1
- pipes-concurrency-2.0.10

However, note that the suite passes if an older version of hspec is used

resolver: nightly-2018-03-18
extra-deps:
- hspec-2.4.8
- hspec-core-2.4.8
- hspec-discover-2.4.8
- Decimal-0.5.1
- pipes-concurrency-2.0.10

This is an unfortunate situation with ghc/hspec, and I'm not sure if there is a proper resolution to it.
See also: jcristovao/enclosed-exceptions#12

[louispan]

Thanks for the detailed steps to reproduce. I can reproduce it and will try to find time over the week to fix it. Unfortunately, in the meantime it'll have to stay off stackage :(

[louispan]

I couldn't work out a way to avoid the test failure. I've commented out the test for now 0748c89.