I'm using this code to make 2 corners of a button rounded. 

```
let buttonPath = UIBezierPath(roundedRect: button.bounds,
                              byRoundingCorners: .TopLeft | .BottomLeft, 
                              cornerRadii: CGSizeMake(1.0, 1.0))

```

It throws an error:

> 
> binary operator '|' cannot be applied to two UIRectCorner operands.
> 
> 
> 

How do I use this method in Swift 2.0?