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  The names in an argument list can be back-quoted non-standard names
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  The names in an argument list can be back-quoted non-standard names
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  (see \sQuote{\link{backquote}}).
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  (see \sQuote{\link{backquote}}).
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  If \code{value} is missing, \code{NULL} is returned.  If it is a
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  If \code{value} is missing, \code{NULL} is returned.  If it is a
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  single expression, the value of the evaluated expression is returned.
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  single expression, the value of the evaluated expression is returned.
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  (The expression is evaluated as soon as \code{return} is called, in
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  the evaluation frame of the function and before any
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  \code{\link{on.exit}} expression is evaluated.)
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  If the end of a function is reached without calling \code{return}, the
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  If the end of a function is reached without calling \code{return}, the
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  value of the last evaluated expression is returned.
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  value of the last evaluated expression is returned.
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}
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}
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\section{Warning}{
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\section{Warning}{
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  Prior to \R 1.8.0, \code{value} could be a series of non-empty
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  Prior to \R 1.8.0, \code{value} could be a series of non-empty