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It is not allowed to cast to a bool.
Erroneous code example:
```compile_fail,E0054
let x = 5;
// Not allowed, won't compile
let x_is_nonzero = x as bool;
```
If you are trying to cast a numeric type to a bool, you can compare it with
zero instead:
```
let x = 5;
// Ok
let x_is_nonzero = x != 0;
```
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