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}
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}
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\details{
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\details{
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  To use post-mortem debugging, set the option \code{error} to be a call
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  To use post-mortem debugging, set the option \code{error} to be a call
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  to \code{dump.frames}.  By default this dumps to an \R object
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  to \code{dump.frames}.  By default this dumps to an \R object
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  \code{"last.dump"} in the workspace, but it can be set to dump to a
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  \code{"last.dump"} in the workspace, but it can be set to dump to a
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  file (as dump of the object produced by a call to \code{\link{save}}).
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  file (a dump of the object produced by a call to \code{\link{save}}).
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  The dumped object contain the call stack, the active environments and
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  The dumped object contain the call stack, the active environments and
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  the last error message as returned by \code{\link{geterrmessage}}.
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  the last error message as returned by \code{\link{geterrmessage}}.
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  When dumping to file, \code{dumpto} gives the name of the dumped
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  When dumping to file, \code{dumpto} gives the name of the dumped
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  object and the file name has \code{.rda} appended.
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  object and the file name has \code{.rda} appended.
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  If \code{dump.frames} is installed as the error handler, execution
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  If \code{dump.frames} is installed as the error handler, execution
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  will continue even in non-interactive sessions. See the examples for
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  will continue even in non-interactive sessions. See the examples for
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  how to dump and then quit.
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  how to dump and then quit.
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}
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}
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\value{
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\value{
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  None.
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  Invisible \code{NULL}.
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}
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}
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\note{
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\note{
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  Functions such as \code{\link{sys.parent}} and
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  Functions such as \code{\link{sys.parent}} and
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  \code{\link{environment}} applied to closures will not work correctly
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  \code{\link{environment}} applied to closures will not work correctly
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  inside \code{debugger}.
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  inside \code{debugger}.