Function lua_cpcall 

pub unsafe extern "C-unwind" fn lua_cpcall(
    L: *mut lua_State,
    func: lua_CFunction,
    ud: *mut c_void,
) -> lua_Status

Calls a protected C function with a single light userdata argument.

The function is executed with only one element, the light userdata ud on its stack. In the case of an error, this function returns the same error codes as lua_pcall and with the same error object on the stack.

When the call is successful, this function returns LUA_OK and the stack is left unchanged.

Values returned by the C function are discarded.