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

A reference outlives the data it points to. Rust’s borrow checker prevents dangling references.

Fix 1: Return Owned Data Instead of Reference

// ❌ Returning reference to local variable
fn get_name() -> &str {
    let name = String::from("Alice");
    &name  // 💥 name is dropped at end of function
}

// ✅ Return owned String
fn get_name() -> String {
    String::from("Alice")
}

Fix 2: Extend the Lifetime

// ❌ Temporary dropped too soon
let r;
{
    let x = 5;
    r = &x;  // 💥 x dropped here
}
println!("{}", r);

// ✅ Move x to outer scope
let x = 5;
let r = &x;
println!("{}", r);

Fix 3: Use Clone

// ❌ Borrowing from a temporary
let first = vec!["a", "b", "c"].first();  // 💥 Vec is temporary

// ✅ Clone the data
let items = vec!["a", "b", "c"];
let first = items.first();

Fix 4: Lifetime Annotations in Structs

// ❌ Struct holds reference but no lifetime
struct Config {
    name: &str,  // 💥 Missing lifetime
}

// ✅ Add lifetime annotation
struct Config<'a> {
    name: &'a str,
}

Fix 5: Use String Instead of &str in Structs

// ✅ Owned data — no lifetime needed
struct Config {
    name: String,  // Owns the data
}

This is often the simplest fix. Use owned types (String, Vec<T>) in structs unless you have a specific reason to borrow.

Related resources

• Rust borrow checker fix
• Rust move after borrow fix
• Rust cheat sheet

Related: Cargo Cheat Sheet