Function libsqlite3_sys::sqlite3_collation_needed

pub unsafe extern fn sqlite3_collation_needed(arg1: *mut sqlite3,
                                              arg2: *mut c_void,
                                              arg3: Option<unsafe extern fn(_: *mut c_void, _: *mut sqlite3, _: c_int, _: *const c_char)>)
                                              -> c_int