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Showing content from https://github.com/rust-lang/rust/issues/143894 below:

Tracking Issue for `const_default` · Issue #143894 · rust-lang/rust · GitHub

Feature gate: #![feature(const_default)]

This is a tracking issue for Default in const fn

// core::default

pub const trait Default: Sized {
    fn default() -> Self;
}

impl const Default types:

• ()
• bool
• char
• std::ascii::Char
• usize
• u8
• u16
• u32
• u64
• u128
• i8
• i16
• i32
• i64
• i128
• f16
• f32
• f64
• f128
• std::marker::PhantomData<T>
• Option<T>
• std::iter::Empty<T>
• std::ptr::Alignment
• &[T]
• &mut [T]
• &str
• &mut str
• String
• Vec<T>

(Remember to update the S-tracking-* label when checking boxes.)

• Implementation: Make Default const and add some const Default impls #134628
• Final comment period (FCP)¹
• Stabilization PR

• Blocked on Tracking Issue for RFC 3762, "Make trait methods callable in const contexts" #143874

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

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