E0277 rust type_error ai_generated true

错误[E0277]：`Rc<dyn Trait>` 无法在线程间安全发送

error[E0277]: `Rc<dyn Trait>` cannot be sent between threads safely

ID: rust/e0277-trait-bound-send-not-satisfied-for-rc

其他格式: JSON · Markdown 中文 · English
90%修复率
85%置信度
1证据数
2024-02-15首次发现

版本兼容性

版本状态引入弃用备注
Rust 1.75.0 active — — —
Rust 1.80.0 active — — —
Rust nightly 2024-01-01 active — — —

根因分析

Rc 使用非原子引用计数，无法在线程间安全共享，因此未实现 Send trait。

English

Rc is not Send because it uses reference counting without atomic operations, making it unsafe to share across threads.

generic

官方文档

https://doc.rust-lang.org/stable/error_codes/E0277.html

解决方案

  1. Replace `Rc<dyn Trait>` with `Arc<dyn Trait>` which uses atomic reference counting and implements Send
  2. Use `std::sync::Mutex<Box<dyn Trait>>` if you need mutable access from multiple threads

无效尝试

常见但无效的做法:

  1. Wrap Rc in a Mutex: `Mutex<Rc<dyn Trait>>` 90% 失败

    Mutex only provides interior mutability, not Send. Rc still prevents Send because the reference count isn't atomic.

  2. Add `unsafe impl Send for MyType` manually 95% 失败

    Unsafe impl can cause data races and undefined behavior if Rc is actually used across threads; the compiler warning is legitimate.