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Mention Drop in enum discriminant coercion entry. - #2392
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Per [the reference entry for `as` casts](https://doc.rust-lang.org/reference/expressions/operator-expr.html#r-expr.as.enum.no-drop), fieldless enums must also not implement `Drop` for casting to be allowed. Update the enumerations page to reflect that.
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Per the reference entry for
ascasts, fieldless enums must also not implementDropfor casting to be allowed.This PR updates the enumerations page to reflect that.