[Rd] No traceback in r-patched

[Roger D. Peng]

Since it's heading towards release, I thought I'd bring this up again. 
I'm still not getting any traceback()'s in recent R-patched.  For 
example, I get:

> log("a")
Error in log(x) : Non-numeric argument to mathematical function
> traceback()
No traceback available
Or when running the examples in the traceback() help page:

>      foo <- function(x) { print(1); bar(2) }
>      bar <- function(x) { x + a.variable.which.does.not.exist }
>      ## Don't run:
>      foo(2) # gives a strange error
[1] 1
Error in bar(2) : Object "a.variable.which.does.not.exist" not found
>      traceback()
No traceback available
It seems the .Traceback variable is not being created.  If I'm doing 
something incorrectly, I'd very much like to know.  I'm starting up with 
R --vanilla.

> version
         _
platform i686-pc-linux-gnu
arch     i686
os       linux-gnu
system   i686, linux-gnu
status   alpha
major    1
minor    8.1
year     2003
month    11
day      07
language R
> search()
[1] ".GlobalEnv"      "package:methods" "package:ctest"   "package:mva"
[5] "package:modreg"  "package:nls"     "package:ts"      "Autoloads"
[9] "package:base"
>
-roger

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