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Tracking issue for FromStr trait usage in const fn #59133

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Tracking issue for FromStr trait usage in const fn#59133
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A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCT-libsRelevant to the library team, which will review and decide on the PR/issue.

Description

@elichai
elichai
opened on Mar 12, 2019

Because Rust already have macros that evaluate on compile time to strings I think converting them to ints in a const fn is a very nice feature.

e.g. env!("SOMETHING").parse::<usize>().unwrap()

I opened this Issue as part of: #57563
Interested to hear if other people want this and if it's already exists as part of a different issue/RFC

Activity

  1. Imagejonas-schievink
    added
    A-const-fn
    C-feature-requestCategory: A feature request, i.e: not implemented / a PR.
    on Mar 12, 2019
  2. ImageCentril
    added
    T-libs-api[DEPRECATED; DO NOT USE]
    on Nov 6, 2019

  3. jonas-schievink commented on Nov 22, 2020

    @jonas-schievink
    jonas-schievink
    on Nov 22, 2020
    Contributor

    Isn't this just #67792 / rust-lang/rfcs#2632?

  4. ImageDylan-DPC
    added
    C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFC
    and removed
    C-feature-requestCategory: A feature request, i.e: not implemented / a PR.
    on Dec 4, 2023
  5. Imagebors
    added a commit that references this issue on Mar 30, 2024

    Auto merge of rust-lang#99322 - GKFX:const-int-parse, r=Mark-Simulacrum

    8df7e72

  6. Skgland commented on May 9, 2024

    @Skgland
    Skgland
    on May 9, 2024
    Contributor

    It looks like the const_int_from_str feature, gate-ing the constness of the {integer}::from_str_radix associated method, also points here. Would it be possible to have that stabilized as it (as far as I can see/tell) does not depend on const trait?, unlike the constness of the FromStr trait (impls) this is otherwise about.

    This would allow parsing ints at complie-time, e.g. from env!(), which I belive would help alot as that is the primary thing I find myself wanting to parse at compile-time.

  7. Imagetgross35
    added 3 commits that reference this issue on Jul 26, 2024

    Rollup merge of rust-lang#124941 - Skgland:stabilize-const-int-from-s…

    7e47a5b

    Rollup merge of rust-lang#124941 - Skgland:stabilize-const-int-from-s…

    0e50d42

    Rollup merge of rust-lang#124941 - Skgland:stabilize-const-int-from-s…

    86721a4
  8. Imagerust-timer
    added a commit that references this issue on Jul 27, 2024

    Unrolled build for rust-lang#124941

    951e878
  9. Imageflip1995
    added a commit that references this issue on Aug 8, 2024

    Rollup merge of #124941 - Skgland:stabilize-const-int-from-str, r=dto…

    eb2fc42
  10. ImageRalfJung
    added
    A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)
    and removed
    A-const-fn
    on Dec 1, 2024
  11. Imageclarfonthey
    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
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