regression: transmute_copy validates sizing #100545

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1. Mark-Simulacrum

   added

   T-libs-api[DEPRECATED; DO NOT USE][DEPRECATED; DO NOT USE]

   regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

   I-libs-api-nominated[DEPRECATED; DO NOT USE][DEPRECATED; DO NOT USE]

   on Aug 14, 2022
2. Mark-Simulacrum

   added this to the 1.64.0 milestone on Aug 14, 2022
3. rustbot

   added

   I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}Issue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}

   on Aug 14, 2022
4. Mark-Simulacrum

   removed

   I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}Issue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}

   on Aug 14, 2022
5. estebank commented on Aug 15, 2022

   

   estebank

   on Aug 15, 2022

   Last edited by estebank

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   I believe this is the same as #99923

   Edit: I meant "the same category as".
6. Mark-Simulacrum commented on Aug 15, 2022

   

   Mark-Simulacrum

   on Aug 15, 2022

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   Seems like a much easier issue to explain, at least - not sure I would quite call it "same as" pointer/integer transmutes :) Though the overall effect of breaking unsafe code seems quite similar.

   👍React with 👍1Reacted by Esteban Kuber
7. RalfJung commented on Aug 15, 2022

   

   RalfJung

   on Aug 15, 2022

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   I believe this is the same as #99923

   The issues seem entirely unrelated to me, in which sense are they "the same"?
8. RalfJung commented on Aug 15, 2022

   

   RalfJung

   on Aug 15, 2022

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   Or did you mean they are broadly the same category, being related to UB detection? But even then, #99923 is about compile-time UB, and this here is primarily about run-time UB, and those are very different in how we treat them.
10. RalfJung commented on Aug 15, 2022

    

    RalfJung

    on Aug 15, 2022

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    Yeah, we could have a cfg_attr(debug_assertions, track_caller) but that would only help once we have a good system for letting people use a debug build of the standard library...
11. m-ou-se

    removed

    I-libs-api-nominated[DEPRECATED; DO NOT USE][DEPRECATED; DO NOT USE]

    on Sep 13, 2022
12. dtolnay

    added

    relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

    on Sep 13, 2022
13. m-ou-se

    closed this as completedon Nov 9, 2022