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Auto merge of #69079 - CAD97:layout-of-ptr, r=RalfJung
Allow calculating the layout behind a pointer There was some discussion around allowing this previously. This does make the requirement for raw pointers to have valid metadata exposed as part of the std API (as a safety invariant, not validity invariant), though I think this is not strictly necessarily required as of current. cc @rust-lang/wg-unsafe-code-guidelines Naming is hard; I picked the best "obvious" name I could come up with. If it's agreed that this is actually a desired API surface, I'll file a tracking issue and update the attributes.
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