I don’t remember when 3.9 was, but I’m pretty sure it was after the steering council took over.
selecting on it still caused a deadlock. That's not specific to select!,
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yield in Crystal is a very simple version of effects, since it will only allow jumping up one layer in the call stack, if you want to forward a block you need to re-yield when you call another function. There’s also only one possible receiver, the single block passed to the function will be used for all yield statements.
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Англия — Премьер-лига|29-й тур