RobotC vexRT Bug

typedef struct
{
	TVexJoysticks upButton;
	TVexJoysticks downButton;
} myStructType;

myStructType myStruct;

while (true)
{
	myStruct.upButton = Btn8U;
	myStruct.downButton = Btn8D;

	if (vexRT[myStruct.upButton])
	{
		//Do something
	}
	else if (vexRT[myStruct.downButton])
	{
		//Do something different
	}
	else
	{
		//Do nothing
	}
}