Negative tests for the libstdc++ debug mode?

[Benjamin Kosnik]

>So the question is: how many 
>is too many? Would everyone be satisfied with one negative debug test 
>per container, exercising the different error messages? I use about 50 
>of these locally, but they very rarely find anything that isn't found 
>by running the libstdc++ testsuite with debug mode.

One per container sounds fine. However, these new tests should contain
bits that are not being tested currently: don't add negative tests just
to add them. If this stuff is already being tested, don't worry about
it.

best,
benjamin