[Rd] An inconsistency with promise in attributes

[Saikat DebRoy]

When an attribute is a delayed expression sometimes it is not forced 
when it is extracted.

> x <- list()
> attr(x, "p") <- delay(1)
> x
list()
attr(,"p")
<promise: 0x11e4bb8>
> val <- attr(x, "p")
> val
[1] 1
> attr(x, "p")
<promise: 0x11e4bb8>
I am not quite sure whether the above is a bug or not but I think the 
following is a bug - a promise is supposed to give its value once 
evaluated!

> eval(attr(x, "p"))
<promise: 0x11e4bb8>
______________________________________________
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-devel