In the developer release of Test::Simple, Test::Builder has been altered to die if you have any arguments after 'no_plan'. This means that some previously passing tests will fail. In fact, there are two test programs in Moose 0.57 which have this and thus fail to pass:
use Test::More no_plan => 1;
I've recommended that we warn instead of croak as I don't know how widespread this problem is (I'd just fix it, but I don't have external Subversion access at work).
I expect we'll fix this, but for the time being, please don't use 'no_plan => $plan' in your tests.