Constructor glitch

c.cpp

#include <iostream>

struct A
{
    A() { std::cout << "default\n"; }
    A(std::string a) { std::cout << "string\n"; }
};

int main()
{
    auto s = std::string("ala");
    {
        A(s); // default
        // A(s); // error: redeclaration
    }
}