Code for Swing Turn compiling but not working on robot?

Here is my code. When I compile it, it doesn’t show any errors but when I try to work it on the robot, nothing happens. I tried to see if other parts of the code are affected, but the drive works fine.

while(true) {
		if (vexRT[Btn8R] == 1)
		{
			motor[frontLeft] = 10;
			motor[frontRight] = 63;
			motor[backLeft] = 10;
			motor[backRight] = 63;
		}
		else if (vexRT[Btn8L] == 1) 
		{
			motor[frontLeft] = -10;
			motor[frontRight] = -63;
			motor[backLeft] = 10;
			motor[backRight] = 63;
		}
		else 
		{
			motor[frontLeft] = 0;
			motor[frontRight] = 0;
			motor[backLeft] = 0;
			motor[backRight] = 0;
		}

You probably have another while loop somewhere that stops this code from running. Can you post the whole program?