#include <stdio.h>
struct s {
int x;
int y;
};
int main(void)
{
struct s a = {10, 20};
struct s b = {10, 20};
struct s c = {30, 40};
if (a.x == b.x) a.x = c.x;
a = b;
// if (a == b) a = c;
return 0;
}
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