pub type PFNGLSECONDARYCOLOR3FPROC = Option<unsafe extern "C" fn(red: GLfloat, green: GLfloat, blue: GLfloat)>;
enum PFNGLSECONDARYCOLOR3FPROC { None, Some(unsafe extern "C" fn(_: f32, _: f32, _: f32)), }
No value.
Some value of type T.
T