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    }
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    }
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    \item{.Object = "traceable"}{
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    \item{.Object = "traceable"}{
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      Objects of a class that extends \code{traceable} are used to
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      Objects of a class that extends \code{traceable} are used to
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      implement debug tracing (see \link{traceable-class} and
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      implement debug tracing (see \link{traceable-class} and
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      \code{\link[base]{trace}}).
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      \code{\link{trace}}).
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      The \code{initialize} method for these classes takes special
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      The \code{initialize} method for these classes takes special
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      arguments \code{def, tracer, exit, at, print}.  The first of these
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      arguments \code{def, tracer, exit, at, print}.  The first of these
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      is the object to use as the original definition (e.g., a
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      is the object to use as the original definition (e.g., a
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      function).  The others correspond to the arguments to
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      function).  The others correspond to the arguments to
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      \code{\link[base]{trace}}.
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      \code{\link{trace}}.
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    }
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    }
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    \item{.Object = "environment"}{
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    \item{.Object = "environment"}{
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      The \code{initialize} method for environments takes a named list
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      The \code{initialize} method for environments takes a named list
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      of objects to be used to initialize the environment.
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      of objects to be used to initialize the environment.