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\details{
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\details{
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Top-level tasks are individual expressions
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Top-level tasks are individual expressions
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rather than entire lines of input.  Thus an input
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rather than entire lines of input.  Thus an input
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line of the form \code{expression1 ; expression2}
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line of the form \code{expression1 ; expression2}
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will give rise to 2 top-level tasks.
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will give rise to 2 top-level tasks.
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A top-level task callback is called with the expression for the
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A top-level task callback is called with the expression for the
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top-level task, the result of the top-level task, a logical value
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top-level task, the result of the top-level task, a logical value
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indicating whether it was successfully completed or not (always TRUE
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indicating whether it was successfully completed or not (always TRUE
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at present), and a logical value indicating whether the result was
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at present), and a logical value indicating whether the result was
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printed or not.  If the \code{data} argument was specified in the call
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printed or not.  If the \code{data} argument was specified in the call
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 # now remove it, assuming it is still first in the list.
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 # now remove it, assuming it is still first in the list.
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 removeTaskCallback(n)
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 removeTaskCallback(n)
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\dontrun{
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\dontrun{
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# There is no point in running this
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# There is no point in running this
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# as
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# as
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 addTaskCallback(times(4))
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 addTaskCallback(times(4))
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 sum(1:10)
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 sum(1:10)
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 sum(1:10)
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 sum(1:10)
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 sum(1:10)
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 sum(1:10)