chore: Update Lean to v4.33.1 - #608
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Toolchain and dependencies bumped by lean-update.
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formal-conjectures is a corpus of conjectures, not of proofs, so compiling it measures the compiler against statements nobody has proved. That is not what the compile benchmarks are for. CompileFC existed only to build it: a package whose sole dependency was formal-conjectures, held at Lean v4.27.0 because the upstream corpus targets that release. That stale pin was the one thing the nightly lean-update sweep kept finding to move (#608). Its FC matrix entry in the benchmark workflow has been commented out since it fell behind, so nothing in CI loses a job here. With the pin gone, `. Benchmarks/**` sweeps a tree whose packages all track the current toolchain, so lean-update needs no steering around it.
samuelburnham
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Sep 2, 2026
formal-conjectures is a corpus of conjectures, not of proofs, so compiling it measures the compiler against statements nobody has proved. That is not what the compile benchmarks are for. CompileFC existed only to build it: a package whose sole dependency was formal-conjectures, held at Lean v4.27.0 because the upstream corpus targets that release. That stale pin was the one thing the nightly lean-update sweep kept finding to move (#608). Its FC matrix entry in the benchmark workflow has been commented out since it fell behind, so nothing in CI loses a job here. With the pin gone, `. Benchmarks/**` sweeps a tree whose packages all track the current toolchain, so lean-update needs no steering around it.
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lean-toolchainand dependencies updated for Lean releasev4.33.1by lean-update.