examples: Remove accessor definitions

examples/ray.sk

@@ -12,9 +12,6 @@ class Vec
     var @y = y
     var @z = z
   end
-  def x -> Float; @x; end
-  def y -> Float; @y; end
-  def z -> Float; @z; end
 
   def add(b: Vec) -> Vec
     Vec.new(@x + b.x, @y + b.y, @z + b.z)
@@ -69,8 +66,6 @@ class Ray
     @origin = origin
     @dir = dir
   end
-  def origin -> Vec; @origin; end
-  def dir -> Vec; @dir; end
 end
 
 class Isect
@@ -83,18 +78,6 @@ class Isect
     var @distance = distance
     var @ray_dir = ray_dir
   end
-  def hit -> Int; @hit; end
-  def hit=(v: Int); @hit=v; end
-  def hit_point -> Vec; @hit_point; end
-  def hit_point=(v: Vec); @hit_point=v; end
-  def normal -> Vec; @normal; end
-  def normal=(v: Vec); @normal=v; end
-  def color -> Vec; @color; end
-  def color=(v: Vec); @color=v; end
-  def distance -> Float; @distance; end
-  def distance=(v: Float); @distance=v; end
-  def ray_dir -> Vec; @ray_dir; end
-  def ray_dir=(v: Vec); @ray_dir=v; end
 end
 
 class Sphere
@@ -103,9 +86,6 @@ class Sphere
     @position = position
     @color = color
   end
-  def radius -> Float; @radius; end
-  def position -> Vec; @position; end
-  def color -> Vec; @color; end
 
   def intersect(ray: Ray, isect: Isect) -> Void
     rs = ray.origin.sub(@position)
@@ -130,9 +110,6 @@ class Plane
     @normal = normal
     @color = color
   end
-  def position -> Vec; @position; end
-  def normal -> Vec; @normal; end
-  def color -> Vec; @color; end
 
   def intersect(ray: Ray, isect: Isect) -> Void
     d = -(@position.dot(@normal))