Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
cfa8c5a036
This PR fixes a bug where `max u v` and `max v u` fail to match in SymM's pattern matching. Both `processLevel` (Phase 1) and `isLevelDefEqS` (Phase 2) treated `max` positionally, so `max u v ≠ max v u` structurally even though they are semantically equal. The fix has three parts: - Eagerly normalize universe levels in patterns at creation time (`preprocessDeclPattern`, `preprocessExprPattern`, `mkSimprocPatternFromExpr`) - Normalize the target level in `processLevel` before matching, using a `where go` refactor - Add `tryApproxMaxMax` to `processLevel` and `isLevelDefEqS`: when positional `max/max` matching would fail, check if one argument from each side matches structurally and match the remaining pair Also moves `normalizeLevels` from `Grind.Util` to `Sym.Util` to avoid code duplication, since both Sym and Grind need it. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> |
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