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When using withThrowingTaskGroup waitForAll(), thrown errors weren't being propagated. I added a test for this, which failed, and then fixed it.

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Once I found the bug, I used Cursor to generate the test and then the fix. Cursor's initial fix caused other tests to fail, which is why I added the clause about ignoring CancellationErrors. Once that was in place, all tests passed. I reviewed all of the generated code.