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