flexget / flask RESTful not building

[sjau]

Issue description

test_trim_request_parser_override_by_argument (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                 
test_type (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                                     
test_type_callable (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                            
test_type_callable_none (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                       
test_type_decimal (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                             
test_type_filestorage (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                         
test_viewargs (tests.test_reqparse.ReqParseTestCase) ... ok                                                                                                                                                 


======================================================================                                                                                                                                      
ERROR: test_fr_405 (tests.test_api.APITestCase)                                                                                                                                                             
----------------------------------------------------------------------                                                                                                                                      
Traceback (most recent call last):                                                                                                                                                                          
  File "/tmp/nix-build-python2.7-Flask-RESTful-0.3.6.drv-0/Flask-RESTful-0.3.6/tests/test_api.py", line 787, in test_fr_405                                                                                 
    set(['HEAD', 'OPTIONS'] + HelloWorld.methods))                                                                                                                                                          
TypeError: can only concatenate list (not "set") to list                                                                                                                                                    


----------------------------------------------------------------------                                                                                                                                      
Ran 392 tests in 0.426s                                                                                                                                                                                     


FAILED (errors=1)                                                                                                                                                                                           
Test failed: <unittest.runner.TextTestResult run=392 errors=1 failures=0>                                                                                                                                   
error: Test failed: <unittest.runner.TextTestResult run=392 errors=1 failures=0>                                                                                                                            
builder for '/nix/store/j4gfl0m17j6lzkiskscjmbx3p3y8aiay-python2.7-Flask-RESTful-0.3.6.drv' failed with exit code 1                                                                                         
cannot build derivation '/nix/store/ywhwdy9mn4zm569yqgx59xkan85d0hzn-FlexGet-2.13.5.drv': 1 dependencies couldn't be built 

Steps to reproduce

Try to install flexget

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

• system: "x86_64-linux"
• host os: Linux 4.14.24, NixOS, 18.09pre131017.eae4965117a (Impala)
• multi-user?: yes
• sandbox: no
• version: nix-env (Nix) 2.0
• channels(hyper): ""
• channels(root): "nixos"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs

[dotlambda]

I also fixed Flexget in 871447a.