c++/7781: std::string foo = foo + "b" is compiled without warning!

[udbz@rz.uni-karlsruhe.de]

>Number:         7781
>Category:       c++
>Synopsis:       std::string foo = foo + "b" is compiled without warning!
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 30 13:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     udbz@rz.uni-karlsruhe.de
>Release:        gcc-3.0.3
>Organization:
>Environment:

>Description:
The code construct below IMHO never makes sense and
should spill a warning.
>How-To-Repeat:
#include <iostream.h>
#include <string>

int main()
{
       std::string foo = foo + "b"; 
       std::cout << foo << endl;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: