((function length
   (signature float
     (parameters
       (declare (in) float arg0))
     ((return (expression float abs (var_ref arg0)))))

   (signature float
     (parameters
       (declare (in) vec2 arg0))
     ((return (expression float sqrt (expression float dot (var_ref arg0) (var_ref arg0))))))

   (signature float
     (parameters
       (declare (in) vec3 arg0))
     ((return (expression float sqrt (expression float dot (var_ref arg0) (var_ref arg0))))))

   (signature float
     (parameters
       (declare (in) vec4 arg0))
     ((return (expression float sqrt (expression float dot (var_ref arg0) (var_ref arg0))))))
))