compiler/rustc_error_codes/src/error_codes/E0426.md


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An undeclared label was used.

Erroneous code example:

```compile_fail,E0426
loop {
    break 'a; // error: use of undeclared label `'a`
}
```

Please verify you spelled or declared the label correctly. Example:

```
'a: loop {
    break 'a; // ok!
}
```