Rust auto turret swipe

#include <Servo.h>
Servo servo;
int spd = 60; // time between each degree of angle, higher time means slower speed, value must be over 40 or it will not work
int i = 0;
int k = 0;
int ang = 90;
void setup() {
  servo.attach (8);  // connect servo signal to arduino digital pin 8
  servo.write(ang);
  delay(2000);
  ang = 45;
}

void loop() {
  for(i=0;i<90;i++)
  {
    servo.write(ang+i);
    delay(spd);
    }
    delay(1000);
  for(k=89;k>-1;k--)
   {
    servo.write(ang+k);
    delay(spd);
    }
  delay(1000);
}