pub type PFNGLNORMALSTREAM3FATIPROC = Option<unsafe extern "C" fn(stream: GLenum, x: GLfloat, y: GLfloat, z: GLfloat)>;
enum PFNGLNORMALSTREAM3FATIPROC { None, Some(unsafe extern "C" fn(_: u32, _: f32, _: f32, _: f32)), }
No value.
Some value of type T.
T