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iOS Object-Oriented Swift 2.0 Classes Helper Methods

Type '(withRange: Int) -> [Point]' does not conform to protocol 'SequenceType'

I keep getting this error:

Type '(withRange: Int) -> [Point]' does not conform to protocol 'SequenceType'

on my code even though mine is exactly the same as Pasan's. Anyone know why?

Here's the block of code that is generating the error:

func fireAtEnemy (enemy: Enemy) {
    if inRange(self.position, range: self.range, target: enemy.position) { while enemy.life > 0 {
            enemy.decreaseHealth(self.strength)
            print("Enemy vanquished!")
        }
    } else {
        print("darn! the enemy is out of range")

    }
}
    func inRange(position: Point, range: Int, target: Point) -> Bool {
        let availablePositions = position.surroundingPoints
        (attackRange: range)
        for point in availablePositions {
            if (point.x == target.x) && (point.y == target.y) {
                return true
            }
        }

        return false
    }
}

Hey did you figure this one out? I'm getting the same error but for this line of code

    for point in availablePositions {

Error: Type '(Int) -> [Point]' does not conform to protocol 'Sequence'