pub type PFNGLSCISSORARRAYVNVPROC = Option<unsafe extern "C" fn(first: GLuint, count: GLsizei, v: *const GLint)>;
enum PFNGLSCISSORARRAYVNVPROC { None, Some(unsafe extern "C" fn(_: u32, _: i32, _: *const i32)), }
No value.
Some value of type T.
T