Rust Compiler Error Code Index

Quick lookup table: Error code → Skill routing

Ownership & Lifetimes (m01)

Error Code	Message	Skill	Common Fix
E0382	use of moved value	m01-ownership	Use clone(), restructure ownership
E0597	borrowed value does not live long enough	m01-ownership	Extend lifetime, restructure scopes
E0499	cannot borrow as mutable more than once	m01-ownership	Use RefCell, restructure code
E0502	cannot borrow as mutable while immutable borrow exists	m01-ownership	Split borrows, use interior mutability
E0506	cannot assign to borrowed value	m01-ownership	Drop borrow before assignment
E0507	cannot move out of borrowed content	m01-ownership	Use clone(), take(), or restructure
E0515	cannot return reference to local variable	m01-ownership	Return owned value, use lifetime params
E0716	temporary value dropped while borrowed	m01-ownership	Bind to variable, extend lifetime
E0621	explicit lifetime required in the type	m01-ownership	Add lifetime annotations

Mutability (m03)

Error Code	Message	Skill	Common Fix
E0596	cannot borrow as mutable	m03-mutability	Add mut, use interior mutability

Type System (m04)

Error Code	Message	Skill	Common Fix
E0277	the trait bound X is not satisfied	m04-zero-cost / m07-concurrency	Implement trait, add bound, use dyn
E0308	mismatched types	m04-zero-cost	Type conversion, fix generics
E0599	no method named X found for type Y	m04-zero-cost	Import trait, check types

Concurrency (m07)

Error Code	Message	Skill	Common Fix
E0277 (Send)	X cannot be sent between threads safely	m07-concurrency	Use Arc, ensure Send
E0277 (Sync)	X cannot be shared between threads safely	m07-concurrency	Use Mutex, ensure Sync

Ecosystem (m11)

Error Code	Message	Skill	Common Fix
E0425	cannot find value X in this scope	m11-ecosystem	Import with use, check visibility
E0433	failed to resolve: could not find X	m11-ecosystem	Add dependency, fix path
E0603	X is private	m11-ecosystem	Use public API, check exports

Quick Diagnosis Flow

Compiler Error
    ↓
Contains "moved" or "borrow"?
    → m01-ownership
    ↓
Contains "mutable"?
    → m03-mutability
    ↓
Contains "Send" or "Sync" or "thread"?
    → m07-concurrency
    ↓
Contains "trait bound" or "type"?
    → m04-zero-cost
    ↓
Contains "cannot find" or "private"?
    → m11-ecosystem

Common Error Patterns

"value moved here" → m01

let s = String::from("hello");
let s2 = s;  // s moved here
println!("{}", s);  // E0382: use of moved value

"does not live long enough" → m01

fn dangling() -> &str {
    let s = String::from("hello");
    &s  // E0597: s does not live long enough
}

"cannot be sent between threads" → m07

let rc = Rc::new(42);
thread::spawn(move || {
    println!("{}", rc);  // E0277: Rc<i32> cannot be sent
});

"trait bound not satisfied" → m04

fn print_debug<T: Debug>(t: T) {
    println!("{:?}", t);
}
print_debug(SomeType);  // E0277 if SomeType: !Debug

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