Deal with breaking change in QuickCheck

[MaximilianAlgehed]

No description provided.

[MaximilianAlgehed]

@lehins you know more about cabal than I do. Do you understand why cabal suddenly spits out this message when doing cabal test all:

Configuration is affected by the following files:
- cabal.project
Resolving dependencies...
Error: [Cabal-7043]
Cannot test all the packages in the project because none of the components are available to build: the test suite 'cons
trained' is not available because the solver picked a plan that does not include the test suites, perhaps because no su
ch plan exists. To see the error message explaining the problems with such plans, force the solver to include the test 
suites for all packages, by adding the line 'tests: True' to the 'cabal.project.local' file.

Which is fixed by setting tests: true - at which time the tests just build and run normally?

[lehins]

Looks good. Thank you!