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An unreachable label was used.
Erroneous code example:
```compile_fail,E0767
'a: loop {
|| {
loop { break 'a } // error: use of unreachable label `'a`
};
}
```
Ensure that the label is within scope. Labels are not reachable through
functions, closures, async blocks or modules. Example:
```
'a: loop {
break 'a; // ok!
}
```
|
