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\value{
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\value{
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  \code{traceback()} returns nothing, but prints the deparsed call stack
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  \code{traceback()} returns nothing, but prints the deparsed call stack
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  deepest call first.  The calls may print on more that one line, and
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  deepest call first.  The calls may print on more that one line, and
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  the first line is labelled by the frame number.
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  the first line is labelled by the frame number.
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}
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}
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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}
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\examples{
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\examples{
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foo <- function(x) { print(1); bar(2) }
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foo <- function(x) { print(1); bar(2) }
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bar <- function(x) { x + a.variable.which.does.not.exist }
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bar <- function(x) { x + a.variable.which.does.not.exist }
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\dontrun{
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\dontrun{
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foo(2) # gives a strange error
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foo(2) # gives a strange error