pub type PFNGLWINDOWPOS4FMESAPROC = Option<unsafe extern "C" fn(x: GLfloat, y: GLfloat, z: GLfloat, w: GLfloat)>;
enum PFNGLWINDOWPOS4FMESAPROC { None, Some(unsafe extern "C" fn(_: f32, _: f32, _: f32, _: f32)), }
No value.
Some value of type T.
T