Make mem::size_of_val and mem::align_of_val unstably const
#74930
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@bors r+ Please also open a PR against miri, removing the intrinsics there |
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📌 Commit 88fd494 has been approved by |
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☀️ Test successful - checks-actions, checks-azure |
Resolved in rust-lang/miri#1492 (thanks Ralf!) |
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Implements #46571 but does not stabilize it. I wanted this while working on something today.
The only reason not to immediately stabilize are concerns around custom DSTs. That proposal has made zero progress in the last two years and const eval is rich enough to support pretty much any user-defined
lenfunction as long as nightly features are allowed (raw_ptr_deref).Currently, this raises a
const_errlint when passed anextern type.r? @oli-obk
cc @rust-lang/wg-const-eval