Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
f58999a7a6
This PR introduces a no-op version of `Shrink`, a type that should allow shrinking small types into smaller universes given a proof that the type is small enough, and uses it in the iterator library. Because this type would require special compiler support, the current version is just a wrapper around the inner type so that the wrapper is equivalent, but not definitionally equivalent. While `Shrink` is unable to shrink universes right now, but introducing it now will allow us to generalize the universes in the iterator library with fewer breaking changes as soon as an actual `Shrink` is possible. |
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