[Rd] isOpen() misbehaviour

[Karl Forner]

Hello,

>From the doc, it says:
 "isOpen returns a logical value, whether the connection is currently open."

But actually it seems to die on closed connections:
> con <- file()
> isOpen(con)
[1] TRUE
> close(con)
> isOpen(con)
Error in isOpen(con) : invalid connection

Is it expected ?
Tested on R-3.0.2 and R version 3.1.0 Patched (2014-06-11 r65921) on
linux x86_64

Karl