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typedef struct v2d { double x,y; } v2d; void addp(v2d *a, const v2d *b) { a->x += b->x; a->y += b->y; } v2d add(v2d a, v2d b) { addp(&a, &b); return a; } short s(int a, int b) { return a + b; } int i() { return s(1,2); }