SweaveInput + keep.source = TRUE trouble

Dear all,

I have trouble with R-beta sweaving files that include definitions with
\SweaveInput in combination with keep.source = TRUE

Symptom:
SInput is taken from too far down the input file (the shift is the number of
lines of the included file). Is that known? Searching didn't turn up anything,
yet I think there are more people than just me using keep.source.

Example:
$ ~/tmp/R-beta/bin/R CMD Sweave baseline.Rnw&&
mv baseline.tex baseline.devel.tex&&
R CMD Sweave baseline.Rnw&&
mv baseline.tex baseline.2.11.tex&&
diff -u baseline.2.11.tex baseline.devel.tex

gives:
--- baseline.2.11.tex	2010-10-05 11:33:49.000000000 +0200
+++ baseline.devel.tex	2010-10-05 11:33:49.000000000 +0200
@@ -83,7 +83,7 @@
   \verb+\SweaveOpts{keep.source = TRUE}+
   \begin{Schunk}
   \begin{Sinput}
->  12
+>  line 54
   \end{Sinput}
   \begin{Soutput}
   [1] 12
@@ -106,7 +106,7 @@
   line 63 chunk option keep.source = TRUE
   \begin{Schunk}
   \begin{Sinput}
->  14
+>  line 67
   \end{Sinput}
   \begin{Soutput}
   [1] 14

I used yesterday's R-beta, and my system is Ubuntu 9.10 64 bit (though that
probably doesn't matter).

Building the example file I also found that \SweaveInput{} cannot be followed by
anything else on the line(not even a LaTeX comment).

\SweaveInput{x}y
complains that file xy is not found.

Best regards,

Claudia Beleites