Demonstrate Crayon Binary Package Memoise Bug

membug.R

ls(all=T)
# character(0)
install.packages("crayon")
# trying URL 'http://cran.r-project.org/bin/macosx/mavericks/contrib/3.2/crayon_1.3.1.tgz'
# Content type 'application/x-gzip' length 604079 bytes (589 KB)
# ==================================================
# downloaded 589 KB
# 
# 
# The downloaded binary packages are in
# 	/var/folders/56/qcx6p6f94695mh7ywq9m6z_80000gq/T//Rtmp174V1m/downloaded_packages
str(crayon:::i_num_colors)
# function (...)  
#  - attr(*, "memoised")= logi TRUE
sessionInfo()
# R version 3.2.2 (2015-08-14)
# Platform: x86_64-apple-darwin13.4.0 (64-bit)
# Running under: OS X 10.9.5 (Mavericks)
# 
# locale:
# [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
# 
# attached base packages:
# [1] stats     graphics  grDevices utils     datasets  methods   base     
# 
# loaded via a namespace (and not attached):
# [1] tools_3.2.2   memoise_1.0.0 crayon_1.3.1  digest_0.6.9