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use strict;
use AnyEvent;
...

$i3->command("workspace 1")->recv;

use strict;
use AnyEvent;
...
    print "empty workspace!!\n";
  }
}

use strict;
use AnyEvent;
...
    $i3->command("workspace 1")->recv;
  }
}

EV: error in callback (ignoring): AnyEvent::CondVar: recursive blockin
+g wait attempted