Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
de96b6d8a7
This now works: ```lean inductive Tree where | node : List Tree → Tree mutual def Tree.size : Tree → Nat | node ts => list_size ts def Tree.list_size : List Tree → Nat | [] => 0 | t::ts => t.size + list_size ts end ``` It is still out of scope to expect to be able to use nested recursion (e.g. through `List.map` or `List.foldl`) here. Depends on #4718. --------- Co-authored-by: Tobias Grosser <tobias@grosser.es> |
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This is the repository for Lean 4.
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