#[unsafe(no_mangle)]pub unsafe extern "C" fn luaL_optinteger(
L: *mut lua_State,
idx: c_int,
def: lua_Integer,
) -> lua_Integer#[unsafe(no_mangle)]pub unsafe extern "C" fn luaL_optinteger(
L: *mut lua_State,
idx: c_int,
def: lua_Integer,
) -> lua_Integer