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Removal of exact capacity guarantee for Vec::with_capacity() is a breaking change #99385

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#135933
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Removal of exact capacity guarantee for Vec::with_capacity() is a breaking change#99385
#135933
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A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsT-libs-api[DEPRECATED; DO NOT USE]

Description

@GoldsteinE
GoldsteinE
opened on Jul 17, 2022

Link #95614
Cc @jmaargh

Location

https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.with_capacity

Summary

Latest stable guarantees that Vec::with_capacity() always allocates exact capacity (and this is indeed the case, since RawVec discards any extra allocated capacity). #96173 removes this guarantee. I believe this to be a breaking change requiring some further investigation.

Activity

  1. GoldsteinE
    added
    A-docsArea: Documentation for any part of the project, including the compiler, standard library, and tools
    on Jul 17, 2022

  2. the8472 commented on Jul 17, 2022

    @the8472
    the8472
    on Jul 17, 2022
    Member

    Zulip discussion: https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Vec.3A.3Awith_capacity.20promise

  3. m-ou-se
    added
    T-libs-api[DEPRECATED; DO NOT USE]
    I-libs-api-nominated[DEPRECATED; DO NOT USE]
    on Oct 11, 2022
  4. m-ou-se
    removed
    I-libs-api-nominated[DEPRECATED; DO NOT USE]
    on Oct 18, 2022
  5. tgross35
    added a commit that references this issue on Feb 24, 2025

    Rollup merge of rust-lang#135933 - hkBst:patch-19, r=workingjubilee

    dc2b86f
  6. bors
    closed this as completedin dc2b86fon Feb 25, 2025
  7. rust-timer
    added a commit that references this issue on Feb 25, 2025

    Unrolled build for rust-lang#135933

    aea7602
  8. github-actions
    added a commit that references this issue on Feb 26, 2025

    Rollup merge of #135933 - hkBst:patch-19, r=workingjubilee

    1241a6d
  9. github-actions
    added 2 commits that reference this issue on Mar 11, 2025

    Rollup merge of rust-lang#135933 - hkBst:patch-19, r=workingjubilee

    8eba2b6

    Rollup merge of rust-lang#135933 - hkBst:patch-19, r=workingjubilee

    3fc5093
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