#include<cstdlib>
namespace myns {
namespace command{
enum Command{
exit ='c'
};
} // namespace command
void some(const char *s){
using namespace command;
switch(s[0]){
case exit: // 関数exit(int)と衝突する
std::exit(0);
}
}
} // namespace myns
int main()
{
using namespace myns;
char s[16];
some(s);
}
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