1306170255
Dedicated exceptions for `read` failures reduce the risk of mixing up "user" exceptions with those of Future itself. The risk still exists, if the user allows a chronos exception to bubble up explicitly. Because `await` structurally guarantees that the Future is not `pending` at the time of `read`, it does not raise this new exception. * introduce `FuturePendingError` and `FutureCompletedError` when `read`:ing a future of uncertain state * fix `waitFor` / `read` to return `lent` values * simplify code generation for `void`-returning async procs * document `Raising` type helper |
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