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auto merge of #10709 : alexcrichton/rust/snapshot, r=pcwalton
Fix initial debug statements printing twice

It may mislead you into thinking tasks are spawning twice, when in fact they are
not.
auto merge of #10715 : alexcrichton/rust/fix-log-twice, r=huonw

It may mislead you into thinking tasks are spawning twice, when in fact they are
not.