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Teach transmute_{ref,mut}! to handle slice DSTs #1924

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Teach transmute_{ref,mut}! to handle slice DSTs #1924

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Commits on Oct 16, 2024

  1. Teach transmute_{ref,mut}! to handle slice DSTs 

    TODO:
- Figure out how to make this backwards-compatible (since current macros
  work with `T: Sized`, but `T: Sized` does not imply `T: KnownLayout`)
- Make it so that `Sized` bounds are still enforced on older toolchains
  that don't support slice DST transmutes
- Write safety comments
- Get rid of now-unused macros and functions in util::macro_util

Makes progress on #1817

gherrit-pr-id: Ib4bc62202e0b3b09d155333b525087f7aa8f02c2
    @joshlf
    joshlf committed Oct 16, 2024
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