Perfectly valid C - designated initializers

desig_init.c

#include <stdio.h>
#include <math.h>

typedef struct point {
  int x;
  int y;
} Point;

float distance(Point *p1, Point *p2) {
  return sqrt(
    pow((p2->y - p1->y), 2)
    + pow((p2->x - p1->x), 2)
    );
}

int main(void) {
  float d = distance(
    &(Point) {
        .x = 0,
        .y = 0,
      },
    &(Point) {
        .x = 3,
        .y = 4,
      }
    );
    
  printf("%f\n", d);
  return 0;
}