rust/src/test/ui/cenum_impl_drop_cast.rs

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#![deny(cenum_impl_drop_cast)]
enum E {
A = 0,
}
impl Drop for E {
fn drop(&mut self) {
println!("Drop");
}
}
fn main() {
let e = E::A;
let i = e as u32;
//~^ ERROR Cast `enum` implementing `Drop` `E` to integer `u32`
//~| WARN this was previously accepted
}