E0382 🦀 Rust

Rust: error[E0382]: borrow of moved value: `x`

A value was moved (ownership transferred) and then used again.

Seen on: Rust

Meaning

Types like String and Vec move when passed by value or assigned. After a move, the original variable can’t be used. Borrow (&x), clone when you really need two owners, or restructure ownership.

Common causes

  • Passing a String/Vec by value to a function and using it after
  • Moving into a closure (move ||) or thread
  • Using a value after a for loop consumed it (for x in vec)

⚡ Quick fix

  1. Pass a reference (&value) instead
  2. .clone() if you need an independent copy
  3. Iterate by reference (for x in &vec)

Detailed fix by platform

Rust

  1. rust
    fn print_len(s: &String) { println!("{}", s.len()); }
let name = String::from("Ada");
print_len(&name);
println!("{name}");   // still usable

How to diagnose

  1. Move — Line with "value moved here"
  2. Type — Implements Copy?

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