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feat: Void.get_mk#13894

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feat: Void.get_mk#13894
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@tydeu tydeu commented May 29, 2026

This PR enables the original erased value of Void to be extracted noncomputably via Void.get and proved equivalent via Void.get_mk. This makes the Void type useful for carrying relevant logical data that should be erased at runtime.

@tydeu tydeu added the changelog-library Library label May 29, 2026
@github-actions github-actions Bot added the toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN label May 29, 2026
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Reference manual CI status:

  • ❗ Reference manual CI can not be attempted yet, as the nightly-testing-2026-05-20 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-manual, reference manual CI should run now. You can force reference manual CI using the force-manual-ci label. (2026-05-29 17:16:19)

@github-actions github-actions Bot added the mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN label May 29, 2026
@mathlib-lean-pr-testing mathlib-lean-pr-testing Bot added the builds-mathlib CI has verified that Mathlib builds against this PR label May 29, 2026
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