pub type PFNGLMULTITEXCOORD2SARBPROC = Option<unsafe extern "C" fn(_: u32, _: i16, _: i16)>;
enum PFNGLMULTITEXCOORD2SARBPROC { None, Some(unsafe extern "C" fn(_: u32, _: i16, _: i16)), }
No value.
Some value of type T.
T