Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
a12f89aefa
This PR provides the `take` iterator combinator that transforms any iterator into an iterator that stops after a given number of steps. The change contains the implementation and lemmas. `take` has a special implementation of `IteratorLoop` that relies on a potentially more efficient `forIn` implementation of the inner iterator. The mysterious `@[specialize]` on a test has been removed because it is not necessary anymore according to a manual inspection of the IR. Either I erroneously concluded from experiments that it was necessary of something has changed in the meantime that makes it unnecessary. |
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