How would you write this in Haskell?

struct Point {int x; int y;}
distance = sqrt(p.x*p.x + p.y*p.y);

Oh, right, Andrew doesn't know any C-like languages. Hmmm...

A "point" structure with an X and a Y element, and a distance function 
that takes a point and calculates its distance from the origin.

Then, is it possible to add a Z element to the "Point" type without 
having to rewrite the "distance" part? (Sure, it'll give the wrong 
answer, but that's the point I'm trying to make with someone elsewhere 
claiming strong typing avoids this sort of error.)

-- 
   Darren New / San Diego, CA, USA (PST)
     On what day did God create the body thetans?

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