Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
50ca285237
This PR adds `Std.Iter.toHashSet` and variants. Included: variants starting from both monadic and non-monadic iterators, producing extensional and non-extensional hash sets and tree sets. Lemmas are included, showing that `it.toHashSet ~m HashSet.ofList it.toList` (equivalence of hash sets) and `it.toExtHashSet = ExtHashSet.ofList it.toList` (equality of extensional hash sets). |
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| CONTRIBUTING.md | ||
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| lean-toolchain | ||
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