Define pointer metadata#2286
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The pointer-to-pointer cast rules and the wide-pointer validity rule both speak of the *metadata* of a pointer, but we hadn't explicitly defined the term (even though we had defined the contents of that metadata). Let's do that and link to it.
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This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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The pointer-to-pointer cast rules and the wide-pointer validity rule both speak of the metadata of a pointer, but we hadn't explicitly defined the term (even though we had defined the contents of that metadata). Let's do that and link to it.
I'm breaking this out from #2282 so that we can merge the prerequisites before considering the new lang guarantees.
cc @ehuss @RalfJung @Mark-Simulacrum