Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
a824e5b85e
This PR adds iota reduction to the sym-based `mvcgen'` tactic by calling `reduceRecMatcher?` before falling back to the match split backward rule. When a matcher/recursor has a concrete discriminant, it is reduced directly instead of constructing and applying a splitting backward rule, which is significantly faster for benchmarks like `MatchIota` (previously `MatchSplit`) where `loop n` unrolls into `n` nested matches with known `Nat` discriminants. The old `MatchSplit` test case (concrete discriminants) is renamed to `MatchIota` and a new `MatchSplit` test case with symbolic discriminants (matching on state) is added to keep exercising the split backward rule code path. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> |
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