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#include <iostream>
#include <functional>
 
void f(char const*str)
{
    std::cout << str << std::endl;
}
 
int main()
{
    void (*a)() (std::bind(f, "A"));
    void (*b)() (std::bind(f, "B"));
    (*a)();
    (*b)();
    (*a)();
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:11:35: error: cannot convert ‘std::_Bind_helper<false, void (&)(const char*), const char (&)[2]>::type {aka std::_Bind<void (*(const char*))(const char*)>}’ to ‘void (*)()’ in initialization
prog.cpp:12:35: error: cannot convert ‘std::_Bind_helper<false, void (&)(const char*), const char (&)[2]>::type {aka std::_Bind<void (*(const char*))(const char*)>}’ to ‘void (*)()’ in initialization

Standard output is empty