pub type rl_quote_func_t = Option<unsafe extern "C" fn(arg1: *mut c_char, arg2: c_int, arg3: *mut c_char) -> *mut c_char>;
pub enum rl_quote_func_t { None, Some(unsafe extern "C" fn(*mut u8, i32, *mut u8) -> *mut u8), }
No value.
Some value of type T.
T