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Tracking Issue for const_default #143894

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Tracking Issue for const_default#143894
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C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCS-tracking-unimplementedStatus: The feature has not been implemented.T-libsRelevant to the library team, which will review and decide on the PR/issue.

Description

@fee1-dead
fee1-dead
opened on Jul 13, 2025

Feature gate: #![feature(const_default)]

This is a tracking issue for Default in const fn

Public API

// 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>

Steps / History

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

Unresolved Questions

Footnotes

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

Activity

  1. fee1-dead
    added
    T-libs-api[DEPRECATED; DO NOT USE]
    C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFC
    S-tracking-unimplementedStatus: The feature has not been implemented.
    on Jul 13, 2025
  2. JaclynCodes
    added a commit that references this issue on Nov 17, 2025

    Rollup merge of rust-lang#148757 - nxsaken:const_mem_take, r=scottmcm

    b695a37
  3. Zalathar
    added 3 commits that reference this issue on Nov 17, 2025

    Rollup merge of rust-lang#148757 - nxsaken:const_mem_take, r=scottmcm

    968cfd3

    Rollup merge of rust-lang#148757 - nxsaken:const_mem_take, r=scottmcm

    444adf2

    Rollup merge of rust-lang#148757 - nxsaken:const_mem_take, r=scottmcm

    6fe5c1d
  4. rust-timer
    added a commit that references this issue on Nov 17, 2025

    Unrolled build for #148757

    0b9ba3d
  5. github-actions
    added a commit that references this issue on Nov 17, 2025

    Rollup merge of #148757 - nxsaken:const_mem_take, r=scottmcm

    e95325f
  6. github-actions
    added a commit that references this issue on Nov 30, 2025

    Rollup merge of rust-lang#148757 - nxsaken:const_mem_take, r=scottmcm

    6396975
  7. Kivooeo
    added 2 commits that reference this issue on Dec 20, 2025

    Rollup merge of rust-lang#149812 - tisonkun:oncelock-const-default, r…

    2e054a1

    Rollup merge of rust-lang#149812 - tisonkun:oncelock-const-default, r…

    3d3c8e1
  8. Zalathar
    added a commit that references this issue on Dec 21, 2025

    Rollup merge of rust-lang#149812 - tisonkun:oncelock-const-default, r…

    faf4bb8
  9. matthiaskrgr
    added a commit that references this issue on Dec 21, 2025

    Rollup merge of rust-lang#149812 - tisonkun:oncelock-const-default, r…

    e77fdf2
  10. JonathanBrouwer
    added a commit that references this issue on Dec 21, 2025

    Rollup merge of rust-lang#149812 - tisonkun:oncelock-const-default, r…

    02557cc

  11. 19 remaining items

  12. jhpratt
    added a commit that references this issue on Jun 19, 2026

    Rollup merge of rust-lang#157878 - estebank:const-default-btreemap, r…

    ad91026
  13. JonathanBrouwer
    added a commit that references this issue on Jun 19, 2026

    Rollup merge of rust-lang#157878 - estebank:const-default-btreemap, r…

    aa7323d
  14. rust-timer
    added a commit that references this issue on Jun 19, 2026

    Unrolled build for #157878

    5129437
  15. ghaaj
    added a commit that references this issue on Aug 7, 2026

    Rollup merge of #154929 - davidgauch:const-default-lazy, r=jhpratt

    3572889
  16. clarfonthey
    added
    T-libsRelevant to the library team, which will review and decide on the PR/issue.
    and removed
    T-libs-api[DEPRECATED; DO NOT USE]
    on Aug 12, 2026
  17. rust-lang
    blocked asd2584780-sudoon Nov 5, 2026
  18. rust-lang
    deleted a comment from asd2584780-sudo on Nov 5, 2026
  19. JonathanBrouwer
    added 4 commits that reference this issue on Nov 10, 2026

    Rollup merge of rust-lang#153261 - GrigorenkoPV:stabilize/alignment, …

    54abaa5

    Rollup merge of rust-lang#153261 - GrigorenkoPV:stabilize/alignment, …

    f213ec5

    Rollup merge of rust-lang#153261 - GrigorenkoPV:stabilize/alignment, …

    f238012

    Rollup merge of rust-lang#153261 - GrigorenkoPV:stabilize/alignment, …

    ea20e9c
  20. rust-bors
    added a commit that references this issue on Nov 10, 2026

    Unrolled build for #153261 in rollup 165760

    a1140b4
  21. RalfJung
    added a commit that references this issue on Nov 11, 2026

    Rollup merge of #153261 - GrigorenkoPV:stabilize/alignment, r=clarfon…

    04a38c4
  22. github-actions
    added a commit that references this issue on Nov 12, 2026

    Rollup merge of #153261 - GrigorenkoPV:stabilize/alignment, r=clarfon…

    201f15d
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    C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCS-tracking-unimplementedStatus: The feature has not been implemented.T-libsRelevant to the library team, which will review and decide on the PR/issue.

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