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Prove CastUnsized's production layout acceptance gate - #3841

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@joshlf

@joshlf joshlf commented Oct 8, 2026 •

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Move the numerical decision used by CastUnsized's associated constant into
an extracted helper. Preserve sized casts' size-only comparison and require
accepted slice-DST casts to retain alignment, physical tail offset and the
complete size sequence.

Prove that decision and a Rust assertion harness comparing independent
checked sizes, including overflow and zero-sized tails. A rejected DST
comparison need not establish that its size sequences differ. Pointer
construction and validity remain outside these numerical claims.

Authored by an AI agent acting on joshlf's behalf.


Latest Update: v31 — Compare vs v30

📚 Full Patch History

Links show the diff between the row version and the column version.

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📝 Code Review ✅ Completed 2026-10-08T10:25:21.395836Z 029004d PR opened
🔒 Security Review ✅ Completed 2026-10-08T10:27:41.290859Z 029004d PR opened
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@joshlf
joshlf force-pushed the Gytt7syk4w4f52xlmszabgwlaiofsu7p6 branch from 11914d0 to 8b0dc59 Compare October 9, 2026 00:08
@joshlf
joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from 029004d to 867db38 Compare October 9, 2026 00:08
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Codecov Report

❌ Patch coverage is 0% with 47 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (Gytt7syk4w4f52xlmszabgwlaiofsu7p6@7432a5e). Learn more about missing BASE report.

Files with missing lines Patch % Lines
zerocopy/src/pointer/mod.rs 0.00% 47 Missing ⚠️
Additional details and impacted files
@@                         Coverage Diff                          @@
##             Gytt7syk4w4f52xlmszabgwlaiofsu7p6    #3841   +/-   ##
====================================================================
  Coverage                                     ?   52.34%           
====================================================================
  Files                                        ?       31           
  Lines                                        ?     4398           
  Branches                                     ?        0           
====================================================================
  Hits                                         ?     2302           
  Misses                                       ?     2096           
  Partials                                     ?        0           

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@joshlf
joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from 6f2d3a3 to 7bbe97f Compare October 14, 2026 21:43
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joshlf force-pushed the Gytt7syk4w4f52xlmszabgwlaiofsu7p6 branch from e1054a3 to f6aef3c Compare October 15, 2026 00:40
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joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from 7bbe97f to 23abd88 Compare October 15, 2026 00:40
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joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from 23abd88 to e94fe57 Compare October 15, 2026 01:19
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joshlf force-pushed the Gytt7syk4w4f52xlmszabgwlaiofsu7p6 branch from 5f309da to e7c908c Compare October 15, 2026 04:53
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joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from e94fe57 to ffdab92 Compare October 15, 2026 04:53
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joshlf force-pushed the Gytt7syk4w4f52xlmszabgwlaiofsu7p6 branch from e7c908c to 8129e89 Compare October 15, 2026 14:22
@joshlf
joshlf force-pushed the Gciywztxwi6xppau3ds7fviwyaeqk33fj branch from ffdab92 to 1fddaea Compare October 15, 2026 14:22
Move the numerical decision used by CastUnsized's associated constant into
an extracted helper. Preserve sized casts' size-only comparison and require
accepted slice-DST casts to retain alignment, physical tail offset and the
complete size sequence.

Prove that decision and a Rust assertion harness comparing independent
checked sizes, including overflow and zero-sized tails. A rejected DST
comparison need not establish that its size sequences differ. Pointer
construction and validity remain outside these numerical claims.

gherrit-pr-id: Gciywztxwi6xppau3ds7fviwyaeqk33fj
Agent-authored-by: AI agent acting on joshlf's behalf

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