((function isnan
   (signature bool
     (parameters
       (declare (in) float x))
     ((return (expression bool != (var_ref x) (var_ref x)))))
   (signature bvec2
     (parameters
       (declare (in) vec2 x))
     ((return (expression bvec2 != (var_ref x) (var_ref x)))))
   (signature bvec3
     (parameters
       (declare (in) vec3 x))
     ((return (expression bvec3 != (var_ref x) (var_ref x)))))
   (signature bvec4
     (parameters
       (declare (in) vec4 x))
     ((return (expression bvec4 != (var_ref x) (var_ref x)))))))
