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Explicitly note any cast not defined in the documentation is illegal. #982

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1 change: 1 addition & 0 deletions src/expressions/operator-expr.md
Original file line number Diff line number Diff line change
Expand Up @@ -306,6 +306,7 @@ fn average(values: &[f64]) -> f64 {
```

`as` can be used to explicitly perform [coercions](../type-coercions.md), as well as the following additional casts.
Any cast that does not fit either a coercion rule or an entry in the table is a compiler error.
Here `*T` means either `*const T` or `*mut T`.

| Type of `e` | `U` | Cast performed by `e as U` |
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