Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
f20cae3729
This PR sets the `irreducible` attribute before generating the equations for recursive definitions. This prevents these equations to be marked as `defeq`, which could lead to `simp` generation proofs that do not type check at default transparency. This issue is surfacing more easily since well-founded recursion on `Nat` is implemented with a dedicated fix point operator (#7965). Before that, `WellFounded.fix` was used, which is inherently not reducing, so we did get the desired result even without the explicit reducibility setting. Fixes #12398. |
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