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#![feature(assert_matches)]
#![feature(rustc_private)]
//@ edition: 2021
//@ run-pass
// Checks the values accepted by the `TryFrom<u32>` impl produced by `#[derive(TryFromU32)]`.
extern crate rustc_macros;
use core::assert_matches::assert_matches;
use rustc_macros::TryFromU32;
#[derive(TryFromU32, Debug, PartialEq)]
#[repr(u32)]
enum Repr {
Zero,
One(),
Seven = 7,
}
#[derive(TryFromU32, Debug)]
enum NoRepr {
Zero,
One,
}
fn main() {
assert_eq!(Repr::try_from(0u32), Ok(Repr::Zero));
assert_eq!(Repr::try_from(1u32), Ok(Repr::One()));
assert_eq!(Repr::try_from(2u32), Err(2));
assert_eq!(Repr::try_from(7u32), Ok(Repr::Seven));
assert_matches!(NoRepr::try_from(0u32), Ok(NoRepr::Zero));
assert_matches!(NoRepr::try_from(1u32), Ok(NoRepr::One));
assert_matches!(NoRepr::try_from(2u32), Err(2));
}
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