RFA: libstdc++ testsuite PATCH for better error message pruning

[Paolo Carlini]

On 06/15/2010 10:30 PM, Jason Merrill wrote:
> Periodically when I go to poke at libstdc++ tests I am frustrated by
> the libstdc++ testsuite's lack of dg-prune-output, which I have found
> quite handy in the gcc testsuite.  So I finally ported it over, along
> with a bunch of the default pruning patterns.  As a result of the
> latter, a lot of the dg-excess-errors lines in the testsuite become
> unnecessary.
>
> This patch doesn't actually introduce any uses of dg-prune-output,
> that'll come later
OK, thanks.

Paolo.