[R-pkg-devel] RData files with identical objects in package

library(try)
x

getAnywhere("x")

data(afile)
x

Dear friends - I have a package under creation making heavy 
calculations on chemical/clinical data and I plan to include as 
"examples" the use of some literature data used in my papers. To 
illustrate what then occurs, I made two RData files consisting only of 
x and y with different values for x and y like

X <- 100

Y <- 1000

save(x,y,file="first.RData")

and then a new x and y in "second" with x <- 45 and y <- 32

When I put these in a "data" directory of a new package without 
further ado in RStudio

Ctrl-shift-L

Ctrl-shift-B

  

.there is a warning

* installing *source* package 'try' ...

** R

** data

*** moving datasets to lazyload DB

warning: objects 'x', 'y' are created by more than one data call

** byte-compile and prepare package for lazy loading

** help

   converting help for package 'try'

*** installing help indices

     finding HTML links ...    hello                                   html

  done

  

Now, when I clear the workspace:

ls()

character(0)

devtools::load_all(".")

Loading try
  
Restarting R session...
  

library(try)
ls()

character(0)

x   #-- so even if workspace Is empty x is still kept

[1] 45

data(first) # and "first" is not seen x

[1] 45

  

x is still present - and y

  

I have been reading and searching in "Writing R extensions" but so far
didn't find the clue.

Seemingly it is the file with the last name that is assessed - when I rename
first.RData to "xfile.RData" we get 100 and 1000.

Now and then when running ctrl-shift-L and - B we see

  

Attaches package: 'try'
  
The following objects are masked _by_ '.GlobalEnv':
x, y