mirror of https://github.com/rust-lang/rust
31 lines
513 B
Rust
31 lines
513 B
Rust
//@ run-pass
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//@ unset-rustc-env:RUSTC_LOG_COLOR
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// Regression test for https://github.com/rust-lang/rust/issues/73431.
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pub trait Zero {
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const ZERO: Self;
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}
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impl Zero for usize {
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const ZERO: Self = 0;
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}
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impl<T: Zero> Zero for Wrapper<T> {
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const ZERO: Self = Wrapper(T::ZERO);
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}
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#[derive(Debug, PartialEq, Eq)]
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pub struct Wrapper<T>(T);
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fn is_zero(x: Wrapper<usize>) -> bool {
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match x {
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Zero::ZERO => true,
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_ => false,
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}
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}
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fn main() {
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let _ = is_zero(Wrapper(42));
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}
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