| #### Note: this error code is no longer emitted by the compiler |
| |
| Support for Non-Lexical Lifetimes (NLL) has been included in the Rust compiler |
| since 1.31, and has been enabled on the 2015 edition since 1.36. The new borrow |
| checker for NLL uncovered some bugs in the old borrow checker, which in some |
| cases allowed unsound code to compile, resulting in memory safety issues. |
| |
| ### What do I do? |
| |
| Change your code so the warning does no longer trigger. For backwards |
| compatibility, this unsound code may still compile (with a warning) right now. |
| However, at some point in the future, the compiler will no longer accept this |
| code and will throw a hard error. |
| |
| ### Shouldn't you fix the old borrow checker? |
| |
| The old borrow checker has known soundness issues that are basically impossible |
| to fix. The new NLL-based borrow checker is the fix. |
| |
| ### Can I turn these warnings into errors by denying a lint? |
| |
| No. |
| |
| ### When are these warnings going to turn into errors? |
| |
| No formal timeline for turning the warnings into errors has been set. See |
| [GitHub issue 58781](https://github.com/rust-lang/rust/issues/58781) for more |
| information. |
| |
| ### Why do I get this message with code that doesn't involve borrowing? |
| |
| There are some known bugs that trigger this message. |
