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

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GoldsteinE opened this issue Jul 17, 2022 · 1 comment · May be fixed by #135933
Open

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

GoldsteinE opened this issue Jul 17, 2022 · 1 comment · May be fixed by #135933
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A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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@GoldsteinE
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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.
@GoldsteinE GoldsteinE added the A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools label Jul 17, 2022
@the8472
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the8472 commented Jul 17, 2022

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

@workingjubilee workingjubilee mentioned this issue Jul 27, 2022
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@m-ou-se m-ou-se added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. I-libs-api-nominated Nominated for discussion during a libs-api team meeting. labels Oct 11, 2022
@m-ou-se m-ou-se mentioned this issue Oct 11, 2022
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@m-ou-se m-ou-se removed the I-libs-api-nominated Nominated for discussion during a libs-api team meeting. label Oct 18, 2022
@hkBst hkBst linked a pull request Jan 23, 2025 that will close this issue
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