1((function isnan
2   (signature bool
3     (parameters
4       (declare (in) float x))
5     ((return (expression bool != (var_ref x) (var_ref x)))))
6   (signature bvec2
7     (parameters
8       (declare (in) vec2 x))
9     ((return (expression bvec2 != (var_ref x) (var_ref x)))))
10   (signature bvec3
11     (parameters
12       (declare (in) vec3 x))
13     ((return (expression bvec3 != (var_ref x) (var_ref x)))))
14   (signature bvec4
15     (parameters
16       (declare (in) vec4 x))
17     ((return (expression bvec4 != (var_ref x) (var_ref x)))))))
18