Update dependency: deps/haskell-backend_release#4933
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ehildenb
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Jun 16, 2026
The template's lean-toolchain was `stable`, so `lake build` in the generated project floated to the latest stable Lean. v4.31.0 added `ByteArray.decEq` to core, colliding with the template's own definition and breaking the klean/test_generate integration test. Pin to v4.30.0, the last stable before the conflict. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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@tothtamas28 pinging you to make you aware of the Lean version pinning. |
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Also pins Lean toolchain for klean codegen.
CI integration test
klean/test_generatestarted failing independently of the haskell-backend bump: the klean template'slean-toolchainwas set tostable, solake buildin the generated project floated to the latest stable Lean. v4.31.0 addedByteArray.decEqto core, which collides with the definition the template emits (Prelude.lean:226), failing the build with`ByteArray.decEq` has already been declared. Pinned the template'slean-toolchaintoleanprover/lean4:v4.30.0(last stable before the conflict; verified locally that v4.29.1 and v4.30.0-rc2 compile the generatedByteArray.decEqcleanly).Follow-up (out of scope): the template still hand-rolls
ByteArray.decEq; to move to Lean ≥4.31 it should drop that and use core'sDecidableEq ByteArray.