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Auto merge of #155321 - briansmith:b/bufwriter-conservative, r=Mark-Simulacrum
`BufWriter`: Make the soundness of `BorrowedBuf` usage clearer.
The previous safety comment was outdated as it was written before `BorrowedBuf::set_init` was changed to be a boolean.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.0 file changed
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