[Bug libstdc++/54392] [4.6/4.7/4.8 Regression] std::string::assign() fails to update length

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54392

--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-29 
15:32:29 UTC ---
Note that the last snippet definitely caused problems even before the recent
changes. Can't be a regression. Given the current status of the implementation
I'm not sure if is worth fixing right now.