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fix: use v in Lean.toolchain for release versions - #15150

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@thorimur

@thorimur thorimur commented Sep 14, 2026

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This PR ensures that Lean.toolchain includes a v for release versions, e.g. "leanprover/lean4:v4.34.0-rc2", to match the standard format of toolchains in lean-toolchain files. (This also enables ToolchainVer.ofString to succeed on Lean.toolchain.)

@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 Sep 14, 2026

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downstream

@Garmelon

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downstream

@github-actions github-actions Bot added the downstream Request a downstream-lean4 adaptation PR. label Sep 14, 2026
@Garmelon Garmelon removed the downstream Request a downstream-lean4 adaptation PR. label Sep 14, 2026
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