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BufWriter: Make the soundness of BorrowedBuf usage clearer.#155321

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briansmith wants to merge 1 commit intorust-lang:mainfrom
briansmith:b/bufwriter-conservative
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BufWriter: Make the soundness of BorrowedBuf usage clearer.#155321
briansmith wants to merge 1 commit intorust-lang:mainfrom
briansmith:b/bufwriter-conservative

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The previous safety comment was outdated as it was written before BorrowedBuf::set_init was changed to be a boolean. It also failed to address the possibility that flush_buf invalidated the assumption.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 15, 2026
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rustbot commented Apr 15, 2026

r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
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The reviewer was selected based on:

  • Owners of files modified in this PR: @ChrisDenton, libs
  • @ChrisDenton, libs expanded to 8 candidates
  • Random selection from Mark-Simulacrum, jhpratt

The previous safety comment was outdated as it was written before
`BorrowedBuf::set_init` was changed to be a boolean. It also failed
to address the possibility that `flush_buf` invalidated the
assumption.
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