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  These structures are for C (and R function) top-level task handlers.
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  These structures are for C (and R function) top-level task handlers.
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  Such routines are called at the end of every (successful) top-level task
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  Such routines are called at the end of every (successful) top-level task
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  in the regular REPL.
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  in the regular REPL.
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 */
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 */
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#include "Rinternals.h"
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#include <Rinternals.h>
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/**
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/**
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  The signature of the C routine that a callback must implement.
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  The signature of the C routine that a callback must implement.
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  expr - the expression for the top-level task that was evaluated.
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  expr - the expression for the top-level task that was evaluated.
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  value - the result of the top-level task, i.e. evaluating expr.
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  value - the result of the top-level task, i.e. evaluating expr.
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  succeeded - a logical value indicating whether the task completed propertly.
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  succeeded - a logical value indicating whether the task completed propertly.