unit-test-example failure

gistfile1.txt

codio@saturn-granite:~/workspace$ cabal test                                                                  
Running 2 test suites...                                                                                      
Test suite spec: RUNNING...                                                                                   
Test suite spec: PASS                                                                                         
Test suite logged to: dist/test/unit-test-example-0.0.0-spec.log                                              
Test suite doctest: RUNNING...                                                                                
### Failure in Codec/Base64.hs:14: expression `decode (encode xs) == xs'                                      
                                                                                                              
<interactive>:37:3:                                                                                           
    Not in scope: ‘polyQuickCheck’                                                                            
    In the splice: $(polyQuickCheck (mkName "doctest_prop"))                                                  
                                                                                                              
<interactive>:37:3:                                                                                           
    GHC stage restriction:                                                                                    
      ‘polyQuickCheck’ is used in a top-level splice or annotation,                                           
      and must be imported, not defined locally                                                               
    In the expression: polyQuickCheck (mkName "doctest_prop")                                                 
    In the splice: $(polyQuickCheck (mkName "doctest_prop"))                                                  
Examples: 3  Tried: 3  Errors: 0  Failures: 1                                                                 
Test suite doctest: FAIL                                                                                      
Test suite logged to: dist/test/unit-test-example-0.0.0-doctest.log                                           
1 of 2 test suites (1 of 2 test cases) passed.

One other thing, pointed out to me tonight at the workshop, was that I forgot to mention the need to remove old config directories ~/.ghc and ~/.cabal when installing much newer versions of GHC and Cabal. For reference, I have updated my instructions accordingly.