R devel - Sep 2010 - Sweave issue; keep.source=TRUE and cacheSweave incompatible?

This could well be a package-specific issue, and so perhaps not for R-devel. 
The author of the relevant package is CC'd in any event.

I'm seeing some odd behavior from Sweave with keep.source=TRUE when using
driver=cacheSweaveDriver from the cacheSweave package.

It would seem that code chunks with keep.source=TRUE aren't being parsed
correctly; the corresponding Schunk starts at the *very top* of the Rnw file,
snippet shown below.

The error seems specific to R 2.12.0; cacheSweave + keep.source=TRUE seems to
work ok in R 2.11.

Many thanks

— Simon

Version details: 

R version 2.12.0 Under development (unstable) (2010-09-10 r52888)
cacheSweave package 0.4-4

Sweave invocation and output:
> Sweave("test.Rnw",driver="cacheSweaveDriver")
Writing to file test.tex
Processing code chunks ...
 1 : term hide (label=setCache)
 2 : echo term verbatim (label=rnorm)
 3 : echo keep.source term verbatim (label=runif)
 4 : echo term verbatim (label=summary)

You can now run LaTeX on 'test.tex'


Bad Schunk:

\begin{Schunk}
\begin{Sinput}
> \documentclass{article}
> 
> \usepackage[noae]{Sweave}
> 
> \begin{document}
> \SweaveOpts{prefix.string=foo,png=FALSE,echo=TRUE,eps=FALSE}
> @ 
> <<setCache,echo=FALSE,results=hide>>> library(cacheSweave)
> setCacheDir("./cache")
> @ %def 
> 
> This is a test.
> 
> @
> <<rnorm,cache=TRUE>>> summary(rnorm(n=100))
> @ %def 
> 
> This is another test.
> 
> @ 
> <<runif,cache=TRUE,keep.source=TRUE>>> z <- runif(n=100)
\end{Sinput}
\end{Schunk}


Simon Jackman, Depts of Political Science & (by courtesy) Statistics, 
Stanford University, Stanford, CA 94305-6044, USA.
http://jackman.stanford.edu
Co-Principal Investigator, American National Election Studies
cell: +1 (650) 387 3019  fax: +1 (650) 724-9095





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