Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
eb6c52e7e2
This PR adds a custom type and instance canonicalizer for the (WIP) `grind` tactic. The `grind` tactic uses congruence closure but disregards types, type formers, instances, and proofs. Proofs are ignored due to proof irrelevance. Types, type formers, and instances are considered supporting elements and are not factored into congruence detection. Instead, `grind` only checks whether elements are structurally equal, which, in the context of the `grind` tactic, is equivalent to pointer equality. See new tests for examples where the canonicalizer is important. |
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