Rust error codes, explained

The compiler is not being difficult. Each of these messages is protecting you from a bug that would be a runtime crash in most other languages.

• E0382 — use of moved value

  You used a value after giving its ownership away. Here is what the compiler means and how to fix it.

• E0502 — cannot borrow as mutable because it is also borrowed as immutable

  A read-only reference is still alive while you try to modify the value. Here is why and how to restructure it.

• E0499 — cannot borrow as mutable more than once at a time

  Two exclusive references to the same value overlap. Only one may exist at a time.

• E0106 — missing lifetime specifier

  You returned a reference and the compiler cannot tell what it points into. Here is how to say it.

• E0308 — mismatched types

  The value you supplied is not the type the compiler expected — and Rust never guesses.

• E0425 — cannot find value in this scope

  The name you used is not visible here — a typo, a missing `let`, or a missing `use`.