On Sep 24, 2008, at 15:45 , Dave Thomas wrote:

>  1) Failure:
> test_negative_logic(ShowTestDifference) [/usr/local/rubybook/lib/ 
> ruby/1.9.0/mini/test.rb:229]:
> Failed refutation, no message given
>
>  2) Failure:
> test_positive_logic(ShowTestDifference) [t.rb:5]:
> Failed assertion, no message given.

my fault entirely... I didn't update my backtrace filtering after I  
settled on "refute". Fixed.