Test suite failure with GHC 8

[snoyberg]

> /tmp/stackage-build8/multiset-0.3.2$ runghc -clear-package-db -global-package-db -package-db=/home/stackage/work/builds/nightly/pkgdb Setup configure --enable-tests --package-db=clear --package-db=global --package-db=/home/stackage/work/builds/nightly/pkgdb --libdir=/home/stackage/work/builds/nightly/lib --bindir=/home/stackage/work/builds/nightly/bin --datadir=/home/stackage/work/builds/nightly/share --libexecdir=/home/stackage/work/builds/nightly/libexec --sysconfdir=/home/stackage/work/builds/nightly/etc --docdir=/home/stackage/work/builds/nightly/doc/multiset-0.3.2 --htmldir=/home/stackage/work/builds/nightly/doc/multiset-0.3.2 --haddockdir=/home/stackage/work/builds/nightly/doc/multiset-0.3.2 --flags=
Configuring multiset-0.3.2...
> /tmp/stackage-build8/multiset-0.3.2$ runghc -clear-package-db -global-package-db -package-db=/home/stackage/work/builds/nightly/pkgdb Setup build
Building multiset-0.3.2...
Preprocessing library multiset-0.3.2...
[1 of 2] Compiling Data.MultiSet    ( Data/MultiSet.hs, dist/build/Data/MultiSet.o )

Data/MultiSet.hs:139:1: warning: [-Wdodgy-imports]
    Module ‘Prelude’ does not export ‘join’

Data/MultiSet.hs:419:1: warning: [-Wredundant-constraints]
    • Redundant constraint: Ord a
    • In the type signature for:
           filter :: Ord a => (a -> Bool) -> MultiSet a -> MultiSet a

Data/MultiSet.hs:425:1: warning: [-Wredundant-constraints]
    • Redundant constraint: Ord a
    • In the type signature for:
           partition :: Ord a =>
                        (a -> Bool) -> MultiSet a -> (MultiSet a, MultiSet a)

Data/MultiSet.hs:580:1: warning: [-Wredundant-constraints]
    • Redundant constraint: Ord a
    • In the type signature for:
           fromMap :: Ord a => Map a Occur -> MultiSet a
[2 of 2] Compiling Data.IntMultiSet ( Data/IntMultiSet.hs, dist/build/Data/IntMultiSet.o )

Data/IntMultiSet.hs:133:1: warning: [-Wdodgy-imports]
    Module ‘Prelude’ does not export ‘join’
Preprocessing test suite 'doctests' for multiset-0.3.2...
[1 of 1] Compiling Main             ( test/Main.hs, dist/build/doctests/doctests-tmp/Main.o )
Linking dist/build/doctests/doctests ...
> /tmp/stackage-build8/multiset-0.3.2$ dist/build/doctests/doctests

/tmp/stackage-build8/multiset-0.3.2/Data/IntMultiSet.hs:671:0: error:
     fatal error: Typeable.h: No such file or directory
     #include "Typeable.h"
     ^
compilation terminated.
doctests: `gcc' failed in phase `C pre-processor'. (Exit code: 1)

[rcook]

@snoyberg, @twanvl: My proposed change should fix the test failures (I think).

@snoyberg: Is there such a thing as a Docker image for Stackage builds so that I can attempt to reproduce all the warnings and the compiler errors?

[rcook]

@snoyberg: Never mind. As per your blog post (https://www.fpcomplete.com/blog/2016/05/moving-stackage-nightly-ghc-8), I tested locally against Stackage nightly-2016-05-26 and all is well.