出现error[E0716]: temporary value dropped while borrowed的情况往往是因为错误地将引用绑定在了临时变量上,在每行代码结尾的分号;处,临时变量释放导致引用的错误绑定。 由于临时变量多出现于函数编程中,因此该问题多发于连续调用函数。 简短案例 // entry: PathBufletfolder_path= entry.path().parent().ok_or_...
error[E0716]: temporary value dropped while borrowed --> :7:10 | 5 | const _: &[u8] = &concat( | --- borrow later used by call 6 | if b"".len() > 0 { 7 | &concat(b"", b"") | ^^^ creates a temporary value which is freed while still in use 8 | } else { |...
temporary value dropped while borrowed consider using a `let` binding to create a longer lived value 为什么会报这个错? 因为maps.lock.unwrap.values... 这一波操作都是链式操作,执行完成后,链式操作中的self 也就是this... 已经销毁了.. 所以 后续的n.next再调用的会出错。。。 这rustc编译器也是。。
此时代码报错 temporary value dropped while borrowed creates a temporary value which is freed while still in userustc 错误原因: Mutex锁的生命周期由于没有单独声明变量,所以member.streams.lock()的生命周期即为当前代码行。 执行到.iter().enumerate();后,锁的生命周期结束,被rust回收。 但此时返回的Iterator...
error[E0716]: temporary value dropped while borrowed --> src/main.rs:45:58 | 45 | print_items::<WindowsMut<'_, _, 2>>(windows_mut(&mut [1, 2, 3])); | ---^^^-- | | | | | creates a temporary which is freed while still in use | argument requires...
error[E0716]: temporary value dropped while borrowed --> src/main.rs:11:21 | 11 | check(unsafe { &f() }); | --- ^^- | | | | | | | temporary value is freed at the end of this statement | | creates a temporary value which is freed while still in use | borrow later used...
// error[E0716]: temporary value dropped while borrowed let out = std::io::stdout().lock(); // ^^^ - temporary value is freed at the end of this statement // | // creates a temporary which is freed while still in use Now the lock guard is...
| ^ `x` dropped here while still borrowed ... 10 | } | - borrowed value needs to live until here 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 上述编译错误告诉我们x没有存在足够长的时间。原因是当运行到第7行时,x将会被销毁,在第10行的时候,r还在引用x,但是此时x已经不存在了,此时编译器将...
在你的代码中，仍然不清楚last: Option<&str>中引用的String的所有者应该是谁。你可以引入一个额外的...
在你的代码中，仍然不清楚last: Option<&str>中引用的String的所有者应该是谁。你可以引入一个额外的...