Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
b763ab8a5e
This PR addresses two review points on `IO.CancelToken`: * `set` now resolves the underlying promise *before* writing the `Bool` fast-path flag, so observing `isSet = true` implies any synchronously chained `onSet` callback has already run. The previous order (flag first, then resolve) was a subtle footgun: code seeing `isSet = true` could not rely on the cancellation task having fired. * The underlying promise and the task it produces are kept private. The prior `task : Task (Option Unit)` accessor is removed; consumers should use `onSet` to react to cancellation. A comment on the structure records that re-exposing the task in the future requires re-auditing the order in `set` for races between the promise and the `Bool` flag. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com> |
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