E0597: borrowed value does not live long enough Rust Origin: Application & API OSI layer 7 · Application Last updated 5 Nov 2026

Rust: error[E0597]: `x` does not live long enough — borrowed value does not live long enough

A reference outlives the value it points to (the value is dropped first).

Exact message you may see error[E0597]: `x` does not live long enoughborrowed value does not live long enoughE0597 `x` dropped here while still borroweddoes not live long enough borrowed value`x` does not live long enough binding `x` declared here
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Seen on: Rust

Meaning

Typical: storing &local in something that lives longer, returning a reference to a local, or inner-scope values referenced from outer variables. Fix by moving the owner to a longer scope, returning owned data, cloning, or using Rc/Arc. In threads use thread::scope or move ownership.

Common causes

  • Reference to a local stored in an outer variable
  • Returning &local
  • Struct holding a reference to a shorter-lived value
  • Closure capturing a reference past its scope
  • Temporary dropped at end of statement

⚡ Quick fix

  1. Declare the owner in the outer scope
  2. Return/store owned values (to_string(), clone())
  3. Use std::thread::scope for borrowing across threads

Detailed fix by platform

Rust

  1. let owner = String::from("x"); let r = &owner; // owner declared before r's use scope

How to diagnose

  1. Owner — Dropped when?
  2. Reference — Used after?
  3. Fix — Scope or ownership?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Application & API. Errors that are often confused with or caused by this one (click to open):

Blocking waiting for file lock on package cache / build directory — Cargo: Blocking waiting for file lock on package cache / on build directory (Rust)Blocking waiting for …E0106: missing lifetime specifier — Rust: error[E0106]: missing lifetime specifier — this function's return type contains a borrowed value, but the signature does not say which one of `x`'s 2 lifetimes it is borrowed from (Rust)E0106: missing lifeti…E0373: closure may outlive the current function — Rust: error[E0373]: closure may outlive the current function, but it borrows `v`, which is owned by the current function (Rust)E0373: closure may ou…E0499: cannot borrow as mutable more than once at a time — Rust: error[E0499]: cannot borrow `v` as mutable more than once at a time (Rust)E0499: cannot borrow …E0502 — Rust: error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable (Rust)E0502E0505: cannot move out of value because it is borrowed — Rust: error[E0505]: cannot move out of `s` because it is borrowed (Rust)E0505: cannot move ou…E0521: borrowed data escapes outside of function — Rust: error[E0521]: borrowed data escapes outside of function — `data` escapes the function body here (tokio::spawn requires 'static) (Rust)E0521: borrowed data …E0596: cannot borrow as mutable, as it is not declared as mutable — Rust: error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable (Rust)E0596: cannot borrow …E0597: bo…

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