rust/tests/ui/rfc-2008-non-exhaustive/enum-as-cast.rs

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// aux-build:enums.rs
extern crate enums;
use enums::FieldLessWithNonExhaustiveVariant;
fn main() {
let e = FieldLessWithNonExhaustiveVariant::default();
let d = e as u8; //~ ERROR casting `FieldLessWithNonExhaustiveVariant` as `u8` is invalid [E0606]
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assert_eq!(d, 0);
}