Function lua_dump 

pub unsafe fn lua_dump(
    L: *mut lua_State,
    writer: unsafe extern "C-unwind" fn(*mut lua_State, *const c_void, usize, *mut c_void) -> i32,
    data: *mut c_void,
    _strip: i32,
) -> i32

Available on crate feature mlua and (crate features lua51 or luajit) only.