Sun, 11 Jan 2015 13:12:47 +0100 do not crash into already running exec, instead join its lazy result in the subsequent step (amending 59f1591a11cb);
wenzelm [Sun, 11 Jan 2015 13:12:47 +0100] rev 59348
do not crash into already running exec, instead join its lazy result in the subsequent step (amending 59f1591a11cb);
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