type Point2D = tuple[x, y: float]

func sumPoints(p1, p2: Point2D): Point2D = (p1.x + p2.x, p1.y + p2.y)

echo sumPoints((x:1.0, y:2.0), (x:3.0, y:4.0))

Don't be repeating the type in the args, nor failing to qualify the x, y 
parameters in the call.

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