[Rd] missing() (PR#1096)

[hosking@watson.ibm.com]

Full_Name: J. R. M. Hosking
Version: 1.3.0
OS: Windows 2000
Submission from: (NULL) (198.81.209.16)


R documentation suggests that if a function argument x is omitted,
missing(x) should return TRUE even if x is subsequently assigned a value.
This happens in S-plus.  But in R:

> test
function(x){
print(missing(x))
if(missing(x)) x<-0
print(missing(x))
invisible()
}
> test()
[1] TRUE
[1] FALSE
> 


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