Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
c4dc338d7d
The current commit only detects lambda expressions that should be lifted eagerly. @kha I added a comment describing why this optimization is useful. Right now, we are not writing code that benefits from this optimization, but it seems very useful for implementing combinators that return a tuple containing functions. I think this is a useful idiom, for example, the combinator may have two parts: one that is the actual action, and another that collects "static properties". Last summer, if I remember correctly, you considered building this kind of combinator for the new Lean parser, but gave up because we did not have compiler support for it. In your case, the "static property" would be the set of tokens. It could also contain the left most token for initializing the Pratt parser table, etc. This commit is the first step to make this kind of code efficient. It will also improve the experiment at `tests/playground/parser/` |
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