[Rd] rm() deletes 'c' if c('a','b') is the argument (PR#9399)

[hanl2 at wyeth.com]

Full_Name: Lixin Han
Version: 2.4.0
OS: Windows 2000
Submission from: (NULL) (155.94.110.222)


A character vector c('a','b') is supplied to rm().  As a result, 'c' is deleted
unintentionally.

> a <- 1:5
> b <- 'abc'
> c <- letters
> ls()
[1] "a" "b" "c"
> rm(c('a','b'))
> ls()
character(0)
>