typemap for std::string results in uncompilable wrapper

Hi,

I am defining a typemap for handling std::string reference args.

%typemap(in) std::string & INPUT (std::string str) {
    STRLEN len;
    const char * value = SvPV((SV *)$input, len);
    if (len > 0) {
        str.assign(value, len);
    }
    $1 = &str;
}

However this results in an error at compile time:
test_wrap.cc:2382:11: error: ‘res2’ was not declared in this scope
     if (SWIG_IsNewObj(res2)) delete arg2;

I verified that res2 has not been defined in the wrapper code. Is there something incorrect with the typemap definition ? Please suggest.

Perl: v5.8.9
Swig: v3.0.12

Warm Regards,
Prashanth PS

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