Pretty printer throws an exception when printing std::stack with a specialized container.

[meator]

Program

#include <stack>
#include <vector>

int main()
{
    std::stack<int, std::vector<int>> test;
    test.push(5);
    test.push(7);
}

Error message

(gdb) p test
Python Exception <class 'gdb.error'>: There is no member or method named __size_.
$1 =

I've made an asciinema recording that demonstrates the issue. If you have any questions or request further information than please comment on this issue.