mkName issue

[tonymorris]

This issue was originally opened on the wrong repository.

tonymorris/fp-course#19

[Tordek]

This seems to be a fault of doctest. I worked around it by changing the doctest dependency to

 , doctest >= 0.9.7 && < 0.9.10

since doctest-0.9.11 was installed and seemingly causing the issue.

[christian-marie]

Reproduced with doctest-0.9.11 and ghc 7.8.2.

I tried @Tordec's quick fix, doesn't look promising with ghc >= 7.8:

(conflict: doctest => ghc>=7.0 && <7.8).

Looks like we will need to fix this properly. I don't have time to look into it just now.

[christian-marie]

Probably this:
sol/doctest#76

[erikd]

The root cause of the problem is actually ghc : https://ghc.haskell.org/trac/ghc/ticket/8831

For some reason that didn't make it into 7.8.2 (fixed too late possibly?) but it should be in 7.8.3.

[dredozubov]

I'm getting this with ghc 7.6.3 and doctest 0.9.11. Ticket shows it's 7.8.* issue, not 7.6.*. Can anyone clarify this?

[cfreeman]

@dredozubov I'm on OSX, with ghc 7.6.3 and doctest 0.9.11. To resolve I had to:

update course.cabal as @Tordek suggested:
, doctest >= 0.9.7 && < 0.9.10

Then explicitly uninstall doctest 0.9.11 with:
ghc-pkg unregister --force doctest

And install doctest 0.9.9 with:
cabal install --only-dependencies --reinstall

Then it was all good.

[dredozubov]

@cfreeman got it to work, thanks!

[tonymorris]

Adding template-haskell >= 2.8 as a dependency in the tests fixes this.