((function noise4
   (signature vec4
     (parameters
       (declare (in) float x))
     ((return (constant vec4 (0 0 0 0)))))
   (signature vec4
     (parameters
       (declare (in) vec2 x))
     ((return (constant vec4 (0 0 0 0)))))
   (signature vec4
     (parameters
       (declare (in) vec3 x))
     ((return (constant vec4 (0 0 0 0)))))
   (signature vec4
     (parameters
       (declare (in) vec4 x))
     ((return (constant vec4 (0 0 0 0)))))
))