Rust errors / Everything else
Rust compiler error · checked with rustc 1.99.0
Rust error E0729: #### Note: this error code is no longer emitted by the compiler
What it means#### Note: this error code is no longer emitted by the compiler
Retired: rustc no longer emits this error code. You may still see it in old answers, books and CI logs from older toolchains; the explanation below is kept for reference.
The compiler team's explanation
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 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.
From rustc --explain E0729 (1.99.0), part of the Rust project, MIT or Apache-2.0. Official page.
Related errors
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- E0727`async` coroutines are not yet supported
- E0733recursion in an async fn requires boxing
- E0752`main` function is not allowed to be `async`
Up next
Often hit nextE0061: this function takes N arguments but M were suppliedA related error from the same family.Read it next →Did this answer your question?