Odd outcome of attr with environments (PR#2148)

Hi everyone,

I think the following error is slightly odd:

fred <- new.env()
happy <- function() fred
happy()

<environment: 0x8a425b8>

attr(happy(), "foo") <- 1:10

Error: invalid (NULL) left side of assignment

It's nothing to do with environments.  happy() is not an variable, so you
can't modify it: eg

R> f<-function(){ 42}
R> f()<-1
Error: invalid (NULL) left side of assignment
R> attr(f(),"foo")<-1
Error: invalid (NULL) left side of assignment
R> f()[1]<-1
Error: invalid (NULL) left side of assignment


	-thomas

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