E0759 rust type_error ai_generated true

error[E0759]: `X` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement

ID: rust/e0759-has-an-anonymous-lifetime

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
1Evidence
2024-01-18First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.74.0 active — — —
1.76.0 active — — —
1.78.0 active — — —

Root Cause

A reference with an elided lifetime (anonymous `'_`) is passed where a `'static` lifetime is required, often in async or thread spawning contexts.

generic

中文

具有省略生命周期（匿名 `'_`）的引用被传递到需要 `'static` 生命周期的上下文中，常见于异步或线程生成场景。

Official Documentation

https://doc.rust-lang.org/error_codes/E0759.html

Workarounds

  1. 85% success Use `Arc<T>` and move the `Arc` into the closure/task: `let shared = Arc::new(data); tokio::spawn(async move { /* use shared */ });` 
    Use `Arc<T>` and move the `Arc` into the closure/task: `let shared = Arc::new(data); tokio::spawn(async move { /* use shared */ });`
  2. 78% success Annotate the lifetime explicitly: `fn foo<'a>(x: &'a str) -> impl 'a + Future { ... }` and ensure the caller owns the data. 
    Annotate the lifetime explicitly: `fn foo<'a>(x: &'a str) -> impl 'a + Future { ... }` and ensure the caller owns the data.

中文步骤

  1. 使用 `Arc<T>` 并将 `Arc` 移入闭包/任务：`let shared = Arc::new(data); tokio::spawn(async move { /* 使用 shared */ });`
  2. 显式标注生命周期：`fn foo<'a>(x: &'a str) -> impl 'a + Future { ... }` 并确保调用者拥有数据。

Dead Ends

Common approaches that don't work:

  1. Adding `'static` lifetime bound to the generic parameter without ensuring the data lives long enough 80% fail

    Causes borrow checker errors or requires `unsafe`; often the data is not actually static.

  2. Using `Box::leak` to create a `&'static mut` reference 70% fail

    Memory leak; only works if the data is truly intended to live forever, rare in practice.