Preserve nested DST padding in layout formulas - #3630
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## main #3630 +/- ##
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- Coverage 91.85% 91.18% -0.68%
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DstLayout flattened a nested slice DST's trailing-padding operation into the alignment of its packed outer container. That could understate the Rust object size, causing safe parsers and allocators to construct references and boxes whose referents extended beyond their backing storage. Represent slice-DST sizes as a normalized prefix plus an independently rounded inner size. Carry that formula through composition, padding, metadata inference, casts, projections, allocation, and split overlap checks. Add regressions for the reported 8-byte-versus-10-byte packed layout, parsing, allocation, zeroing, projection, metadata plateaus, and dynamic padding. Closes #3617 *Authored by an AI agent acting on Josh Liebow-Feeser's behalf.* gherrit-pr-id: Gxauzb34ce7e537xqailxsfsyzknfjcnl
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DstLayout flattened a nested slice DST's trailing-padding operation into the
alignment of its packed outer container. That could understate the Rust object
size, causing safe parsers and allocators to construct references and boxes
whose referents extended beyond their backing storage.
Represent slice-DST sizes as a normalized prefix plus an independently rounded
inner size. Carry that formula through composition, padding, metadata
inference, casts, projections, allocation, and split overlap checks. Add
regressions for the reported 8-byte-versus-10-byte packed layout, parsing,
allocation, zeroing, projection, metadata plateaus, and dynamic padding.
Closes #3617
Authored by an AI agent acting on Josh Liebow-Feeser's behalf.
Latest Update: v8 — Compare vs v7
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git fetch origin refs/heads/Gxauzb34ce7e537xqailxsfsyzknfjcnl && git checkout -b pr-Gxauzb34ce7e537xqailxsfsyzknfjcnl FETCH_HEADCheckout
git fetch origin refs/heads/Gxauzb34ce7e537xqailxsfsyzknfjcnl && git checkout FETCH_HEADCherry Pick
git fetch origin refs/heads/Gxauzb34ce7e537xqailxsfsyzknfjcnl && git cherry-pick FETCH_HEADPull
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