parse_Rd and/or lazyload problem

I'm encountering problems when making lazy-loadable databases of the output from 'parse_Rd'. The lazy-load database is of seemingly limitless size when I try to reload it... Admittedly I am using functions that I'm not really supposed to use, which is why this isn't a bug report, but there does seem to be something strange going on; my code is very similar to code that lives inside 'tools:::.install_package_Rd_objects'. The problems occur with just-released R2.10.0 on Windows.

The examples below use files which can be found at ftp://ftp.csiro.au/MarkBravington, but you'll obviously need to modify the paths. The file "scrunge.Rd" is just "Rdiff.Rd" from the 'tools' package. The file "fakepack.7z" should unzip to create a fake package with a DESCRIPTION file and a "man" directory that contains two Rd files.

Transcript of first example:
eglist <- list( scrunge=tools:::prepare_Rd(  'd:/temp/scrunge.Rd', 
    defines=.Platform$OS.type, stages='install', warningCalls=FALSE))
tools:::makeLazyLoadDB( eglist, 'd:/temp/ll', compress=FALSE)
tools:::fetchRdDB( 'd:/temp/ll')
# Error: cannot allocate vector of size 1.4 Gb

The second example triggers an error with 'tools:::.install_package_Rd_objects' itself. It doesn't happen the first time, but frequently does after the Rd files have been changed. Transcript:

# Make sure d:/temp/help/ is empty, then
test> tools:::.install_package_Rd_objects( 'd:/temp/fakepack', 'd:/temp')
test> tools:::fetchRdDB( 'd:/temp/help/temp')
# All good. Next, I *removed* one of the two Rd files in "d:/temp/fakepack/man", ...
# ...deleted "d:/temp/help/temp*", and tried again
test> tools:::.install_package_Rd_objects( 'd:/temp/fakepack', 'd:/temp')
test> tools:::fetchRdDB( 'd:/temp/help/temp')
Warning: Reached total allocation of 1535Mb: see help(memory.size)
Warning: Reached total allocation of 1535Mb: see help(memory.size)
Warning: Reached total allocation of 1535Mb: see help(memory.size)
Warning: Reached total allocation of 1535Mb: see help(memory.size)
Error: cannot allocate vector of size 1.9 Gb
# Or on other occasions I get
Error: internal error -3 in R_decompress1

Mark Bravington
CSIRO CMIS
Hobart
Australia

--please do not edit the information below--
Version:
 platform = i386-pc-mingw32
 arch = i386
 os = mingw32
 system = i386, mingw32
 status = 
 major = 2
 minor = 10.0
 year = 2009
 month = 10
 day = 26
 svn rev = 50208
 language = R
 version.string = R version 2.10.0 (2009-10-26)
Windows XP (build 2600) Service Pack 2
Locale:
LC_COLLATE=English_Australia.1252;LC_CTYPE=English_Australia.1252;LC_MONETARY=English_Australia.1252;LC_NUMERIC=C;LC_TIME=English_Australia.1252
Search Path:
 .GlobalEnv, ROOT, package:grDevices, package:ad, package:chstuff, package:handy2, package:tweedie, package:statmod, package:handy, package:debug, package:mvbutils, mvb.session.info, package:tools, package:tcltk, package:stats, package:graphics, package:utils, package:methods, Autoloads, package:base