Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
6d5ce9b87f
This PR re-implements `IO.waitAny` using Lean instead of C++. This is to reduce the size and complexity of `task_manager` in order to ease future refactorings. There is an import behavioral change of `IO.waitAny` in this PR. Consider a situation where we have two promises `p1`, `p2` and call `IO.waitAny [p1.result!, p2.result!]` and `p1` resolves instantly. Previously this would just return the result of `p1` and require nothing else. With the new implementation if `p2` is released before being resolved this can cause a panic, even if `IO.waitAny` has already finished. I argue that this is reasonable behavior, given that an invocation of `result!` promises that the promise will eventually be resolved. |
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