rust-compiler-errorslisted

# Rust compiler errors ## Purpose Map a compiler error to its cause, then to the fix that resolves it instead of the fix that moves it. Most numbered errors have an obvious escape (`.clone()`, `'static`, `Rc<RefCell<T>>`) that compiles and leaves the real problem in place. This skill names both. ## First moves ```bash # The full explanation, with a worked example. Works offline. rustc --explain E0499 # One line per diagnostic. Use it when the build produces a wall of output. cargo build --message-format=short # Stop at the first failing crate instead of reporting every downstream break. cargo build --keep-going=false # Machine-readable, for counting error codes across a large failure. cargo build --message-format=json 2>/dev/null | grep -o '"code":{"code":"E[0-9]*"' | sort | uniq -c | sort -rn ``` Fix the first error, then rebuild. A single move error produces a cascade of type errors downstream, and most of them disappear on their own. ## Triage table | Code | Message | What it means | First move | | --- | --- | --- | --- | | E0382 | borrow of moved value | The value was consumed, then used again | Decide the owner; borrow instead of moving | | E0505 | cannot move out of `x` because it is borrowed | A live borrow outlives the move | Shorten the borrow, or move before borrowing | | E0507 | cannot move out of `x` which is behind a shared reference | You need ownership but only hold `&` | `mem::take`, `Option::take`, `clone`, or take `self` | | E0509 | cannot move out