rbind invisible return value (PR#343)

[thomas@biostat.washington.edu]

An assignment in an argument sometimes makes rbind return invisibly

> rbind(diag(3),a<-1:3)
> print(rbind(diag(3),a<-1:3))
     [,1] [,2] [,3]
[1,]    1    0    0
[2,]    0    1    0
[3,]    0    0    1
[4,]    1    2    3

> version
         _                           
platform sparc-sun-solaris2.7        
arch     sparc                       
os       solaris2.7                  
system   sparc, solaris2.7           
status   Under development (unstable)
major    0                           
minor    99.0                        
year     1999                        
month    November                    
day      23                          
language R 


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