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sync: clarify Cond.Wait documentation
The previous wording was unclear and seemingly contradictory.
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@ -53,7 +53,7 @@ func NewCond(l Locker) *Cond {
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// Wait locks c.L before returning. Unlike in other systems,
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// Wait cannot return unless awoken by Broadcast or Signal.
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//
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// Because c.L is not locked when Wait first resumes, the caller
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// Because c.L is not locked while Wait is waiting, the caller
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// typically cannot assume that the condition is true when
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// Wait returns. Instead, the caller should Wait in a loop:
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//
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