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A `break` statement with an argument appeared in a non-`loop` loop.
Example of erroneous code:
```compile_fail,E0571
# let mut i = 1;
# fn satisfied(n: usize) -> bool { n % 23 == 0 }
let result = while true {
if satisfied(i) {
break 2 * i; // error: `break` with value from a `while` loop
}
i += 1;
};
```
The `break` statement can take an argument (which will be the value of the loop
expression if the `break` statement is executed) in `loop` loops, but not
`for`, `while`, or `while let` loops.
Make sure `break value;` statements only occur in `loop` loops:
```
# let mut i = 1;
# fn satisfied(n: usize) -> bool { n % 23 == 0 }
let result = loop { // This is now a "loop" loop.
if satisfied(i) {
break 2 * i; // ok!
}
i += 1;
};
```
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