3e2124bb48
This PR upstreams the Verso parser and adds preliminary support for Verso in docstrings. This will allow the compiler to check examples and cross-references in documentation. After a `stage0` update, a follow-up PR will add the appropriate attributes that allow the feature to be used. The parser tests from Verso also remain to be upstreamed, and user-facing documentation will be added once the feature has been used on more internals.
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586 B
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15 lines
No EOL
586 B
Text
* `structure` and `inductive` commands
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* [#5842](https://github.com/leanprover/lean4/pull/5842) and [#5783](https://github.com/leanprover/lean4/pull/5783) implement a feature where the `structure` command can now define recursive inductive types:
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```lean
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structure Tree where
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n : Nat
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children : Fin n → Tree
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def Tree.size : Tree → Nat
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| {n, children} => Id.run do
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let mut s := 0
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for h : i in [0 : n] do
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s := s + (children ⟨i, h.2⟩).size
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pure s
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```
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* [#5814](https://github.com/leanprover/lean4/pull/5814) |