[libstdc++ PATCH] Fix leak in _Rb_tree::_M_insert (stl_tree.h)

[Paolo Carlini]

Gabriel Dos Reis wrote:

>Would there be a way to systematize these expclicit try-block without
>efficiency loss (a la RAII or sentry)?
>  
>
Indeed, seems a nice medium-term project! But I agree with Chew that
short-term we should probably just consistently use a try/catch here. I'd
like to apply his patch to mainline, 4.0, 3.4 (and 3.3 too?)

Paolo.