Error map

E0499: cannot borrow as mutable more than once at a time Rust: error[E0499]: cannot borrow `v` as mutable more than once at a time

Rust · layer 4, Application & API

Open the full error page →

Centre: this error. First ring: errors it is linked with (8). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.

4 · Application & API 6 · Platform & cloud
E0499: cannot borrow as mutable more than once at a time — Rust: error[E0499]: cannot borrow `v` as mutable more than once at a time (Rust)E0499: cann…E0382 — Rust: error[E0382]: borrow of moved value: `x` (Rust)E0382E0502 — Rust: error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable (Rust)E0502Blocking waiting for file lock on package cache / build directory — Cargo: Blocking waiting for file lock on package cache / on build directory (Rust)Blocking waiting fo…E0596: cannot borrow as mutable, as it is not declared as mutable — Rust: error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable (Rust)E0596: cannot borro…E0505: cannot move out of value because it is borrowed — Rust: error[E0505]: cannot move out of `s` because it is borrowed (Rust)E0505: cannot move …E0597: borrowed value does not live long enough — Rust: error[E0597]: `x` does not live long enough — borrowed value does not live long enough (Rust)E0597: borrowed val…panic: already borrowed: BorrowMutError — Rust: thread 'main' panicked at src/main.rs:8:9: already borrowed: BorrowMutError / already mutably borrowed: BorrowError (Rust)panic: already borr…cargo: failed to get from registry (spurious network error) — Cargo: warning: spurious network error (2 tries remaining): [35] SSL connect error / error: failed to download from `https://index.crates.io/...` (Rust)cargo: failed to ge…E0308 — Rust: error[E0308]: mismatched types — expected `X`, found `Y` (Rust)E0308E0507: cannot move out of a shared reference / index — Rust: error[E0507]: cannot move out of `self.name` which is behind a shared reference (Rust)E0507: cannot move …Cannot access a disposed context instance — ObjectDisposedException: Cannot access a disposed context instance (.NET)Cannot access a dis…E0106: missing lifetime specifier — Rust: error[E0106]: missing lifetime specifier — this function's return type contains a borrowed value, but the signature does not say which one of `x`'s 2 lifetimes it is borrowed from (Rust)E0106: missing life…E0384: cannot assign twice to immutable variable — Rust: error[E0384]: cannot assign twice to immutable variable `x` (Rust)E0384: cannot assig…E0373: closure may outlive the current function — Rust: error[E0373]: closure may outlive the current function, but it borrows `v`, which is owned by the current function (Rust)E0373: closure may …E0277: the trait bound is not satisfied — Rust: error[E0277]: the trait bound `Foo: Display` is not satisfied / `Rc<RefCell<T>>` cannot be sent between threads safely (Rust)E0277: the trait bo…E0599: no method named found for type — Rust: error[E0599]: no method named `push_str` found for struct `Vec<String>` in the current scope (Rust)E0599: no method na…E0716: temporary value dropped while borrowed — Rust: error[E0716]: temporary value dropped while borrowed — creates a temporary value which is freed while still in use (Rust)E0716: temporary va…E0521: borrowed data escapes outside of function — Rust: error[E0521]: borrowed data escapes outside of function — `data` escapes the function body here (tokio::spawn requires 'static) (Rust)E0521: borrowed dat…panic: runtime error: index out of range — Go: panic: runtime error: index out of range [3] with length 3 (Go)panic: runtime erro…panic: slice bounds out of range — Go: panic: runtime error: slice bounds out of range [:5] with capacity 3 (Go)panic: slice bounds…panic: runtime error: integer divide by zero — Go: panic: runtime error: integer divide by zero (Go)panic: runtime erro…ssh port 22 Connection refused — ssh: connect to host x port 22: Connection refused (Linux)ssh port 22 Connect…ssh port 22 Connection timed out — ssh: connect to host x port 22: Connection timed out (Linux)ssh port 22 Connect…Temporary failure in name resolution — ping: google.com: Temporary failure in name resolution (Linux)Temporary failure i…

Directly related (8)

E0382Rust

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

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

E0502Rust

Rust: error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable

You tried to mutate a value while an immutable reference to it is still in use.

Blocking waiting for file lock on package cache / build directoryRust

Cargo: Blocking waiting for file lock on package cache / on build directory

Another cargo process (or rust-analyzer/IDE) holds the lock, so this command waits.

E0596: cannot borrow as mutable, as it is not declared as mutableRust

Rust: error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable

You called a `&mut` method (or took `&mut`) on a binding/reference that isn't mutable.

E0505: cannot move out of value because it is borrowedRust

Rust: error[E0505]: cannot move out of `s` because it is borrowed

You moved a value while a reference to it was still in use.

E0597: borrowed value does not live long enoughRust

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

A reference outlives the value it points to (the value is dropped first).

panic: already borrowed: BorrowMutErrorRust

Rust: thread 'main' panicked at src/main.rs:8:9: already borrowed: BorrowMutError / already mutably borrowed: BorrowError

A `RefCell` was borrowed in conflicting ways at runtime (a mutable borrow while another borrow was alive).

cargo: failed to get from registry (spurious network error)Rust

Cargo: warning: spurious network error (2 tries remaining): [35] SSL connect error / error: failed to download from `https://index.crates.io/...`

Cargo couldn't reach crates.io (network, proxy, TLS or DNS issues).

Two steps away (16)

E0308Rust

Rust: error[E0308]: mismatched types — expected `X`, found `Y`

A value’s type doesn’t match what the context expects — common with &str vs String, Option/Result vs plain values, and integer ty…

E0507: cannot move out of a shared reference / indexRust

Rust: error[E0507]: cannot move out of `self.name` which is behind a shared reference

You tried to take ownership of a value through a reference (or from a Vec/Option behind `&`).

Cannot access a disposed context instance.NET

ObjectDisposedException: Cannot access a disposed context instance

Code used a DbContext after its scope ended — usually async void, fire-and-forget tasks, or capturing a scoped context in a singl…

E0106: missing lifetime specifierRust

Rust: error[E0106]: missing lifetime specifier — this function's return type contains a borrowed value, but the signature does not say which one of `x`'s 2 lifetimes it is borrowed from

The compiler can't infer which input reference the returned/stored reference is tied to.

E0384: cannot assign twice to immutable variableRust

Rust: error[E0384]: cannot assign twice to immutable variable `x`

You reassigned a variable declared without `mut`.

E0373: closure may outlive the current functionRust

Rust: error[E0373]: closure may outlive the current function, but it borrows `v`, which is owned by the current function

A closure borrowing a local is passed somewhere that may outlive it (thread::spawn, tokio::spawn, returned closures).

E0277: the trait bound is not satisfiedRust

Rust: error[E0277]: the trait bound `Foo: Display` is not satisfied / `Rc<RefCell<T>>` cannot be sent between threads safely

A type doesn't implement a trait required by a function, macro or generic bound.

E0599: no method named found for typeRust

Rust: error[E0599]: no method named `push_str` found for struct `Vec<String>` in the current scope

The type doesn't have that method — wrong type, trait not in scope, or missing derive/feature.

E0716: temporary value dropped while borrowedRust

Rust: error[E0716]: temporary value dropped while borrowed — creates a temporary value which is freed while still in use

A reference points to a temporary that's dropped at the end of the statement.

E0521: borrowed data escapes outside of functionRust

Rust: error[E0521]: borrowed data escapes outside of function — `data` escapes the function body here (tokio::spawn requires 'static)

A reference was passed to something requiring `'static` (spawn tasks/threads) but it borrows local data.

panic: runtime error: index out of rangeGo

Go: panic: runtime error: index out of range [3] with length 3

Code accessed a slice, array or string element beyond its length.

panic: slice bounds out of rangeGo

Go: panic: runtime error: slice bounds out of range [:5] with capacity 3

A slice expression `s[a:b]` used bounds outside the slice's length or capacity.

panic: runtime error: integer divide by zeroGo

Go: panic: runtime error: integer divide by zero

Integer division or modulo by zero.

ssh port 22 Connection refusedLinux

ssh: connect to host x port 22: Connection refused

The server answered, but nothing is listening on the SSH port — sshd isn’t running, it uses another port, or a firewall actively…

ssh port 22 Connection timed outLinux

ssh: connect to host x port 22: Connection timed out

SSH packets get no reply — a firewall/security group drops them, the server is off, or the IP is wrong.

Temporary failure in name resolutionLinux

ping: google.com: Temporary failure in name resolution

The Linux host can’t resolve domain names — no working DNS server is configured or reachable.

Map another error

Popular: 500403400ORA-009331064Critical errorFileNotFoundException assemblyTypeError