Recently, Google v8 TryCatch interface changed:

'void* v8::TryCatch::next_' is now private
url: http://code.google.com/p/v8/source/detail?r=3228
diff: http://code.google.com/p/v8/source/diff?spec=svn3228&r=3228&format=side&path=/branches/bleeding_edge/include/v8.h
This is a bleeding edge revision. By the way, the name suffix suggests it should not be used by client code.

Mongo's affected file is scripting/v8_utils.cpp where there are 2 occurrences of TryCatch::next_ in:
std::string toSTLString( const v8::TryCatch * try_catch )
std::ostream& operator<<( std::ostream &s, const v8::TryCatch * try_catch )

Do mongo really needs to loop over that private member ?
mongo does not compile against the bleeding edge version of v8 unless we remove the loops