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c375244038
Add a test showing `#![feature(default_field_values)]` using `#[const_trait] trait Default` (`#![feature(const_default)]` + `#![feature(const_trait_impl)]`).
38 lines
1.0 KiB
Rust
38 lines
1.0 KiB
Rust
//@ check-pass
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// Ensure that `default_field_values` and `const_default` interact properly.
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#![feature(const_default)]
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#![feature(const_trait_impl)]
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#![feature(default_field_values)]
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#![feature(derive_const)]
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#[derive(PartialEq, Eq, Debug)]
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#[derive_const(Default)]
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struct S {
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r: Option<String> = <Option<_> as Default>::default(),
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s: String = String::default(),
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o: Option<String> = Option::<String>::default(),
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p: std::marker::PhantomData<()> = std::marker::PhantomData::default(),
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q: Option<String> = <Option<String> as Default>::default(),
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t: Option<String> = Option::default(),
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v: Option<String> = const { Option::default() },
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}
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const _: S = S { .. };
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const _: S = const { S { .. } };
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const _: S = S::default();
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const _: S = const { S::default() };
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fn main() {
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let s = S { .. };
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assert_eq!(s.r, None);
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assert_eq!(&s.s, "");
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assert_eq!(s.o, None);
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assert_eq!(s.p, std::marker::PhantomData);
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assert_eq!(s.q, None);
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assert_eq!(s.t, None);
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assert_eq!(s.v, None);
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assert_eq!(s, S::default());
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}
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