[Bug c++/81239] std::__cxx11::string& visible in gcc warning output

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81239

--- Comment #6 from Jonny Grant <jg at jguk dot org> ---

> I imagine you may have found out that this goes away if the "const" is
> removed. So it becomes
> void test_params(string & mystr1, string & out_str)

To add, by this I mean the std:: namespace is visible, providing the parameter
is not const