libstdc++/6784: SEGV using istream >> operator under gcc-3.1/sun-sparc-solaris2.6

[Benjamin Kosnik]

> #0  0xff30c620 in number () from /usr/lib/libc.so.1
> #1  0xff30c290 in __doscan_u () from /usr/lib/libc.so.1
> #2  0xff310e90 in sscanf () from /usr/lib/libc.so.1

Ooooh yeah. I remember this. This is a bug in libc's sscanf and extreme
input. You'll have to talk to Sun.

-benjamin