Fix E0713: Borrowed data escapes beyond mutable reference

Mon, 06 Jul 2026 15:08:04 +0800

1. Symptoms

When you encounter Rust compiler error E0713, the compiler produces output similar to the following:

error[E0713]: borrowed data escapes beyond mutable reference
  --> src/main.rs:12:9
   |
12 |     let value = do_something(&mut x);
   |                 ^^^^^^^^^^^^^^^^^ borrowed data escapes beyond mutable reference
   |
   = note: this is a special case of borrowed pointer being returned where the lifetime of the pointer is tied to the mutable reference. This typically happens when a closure captures a reference that must outlive the containing function.
help: consider changing the return type to capture the data with a higher lifetime
   |
   = note: the lifetime from the mutable reference is only valid within the containing function. To fix this, ensure that the lifetime is tied to the output of the function, not the input.

The error message indicates that a borrowed value is escaping the scope of a mutable reference, which violates Rust’s ownership and borrowing rules. You may see this error when working with closures, higher-order functions, or custom data structures that manage references across different lifetimes.

E0713 on ErrorVault — Developer Error Code Dictionary

Fix E0713: Borrowed data escapes beyond mutable reference

1. Symptoms