[ESS] options(error=recover) produces ESS freeze

[Rodney Sparapani]

Peter Meilstrup wrote:
> I keep reproducing a very simple recipe for making ESS and the entire 
> Emacs process freeze:
> 
> 1. set options(error=recover)
> 2. Move to a buffer where there is a group of statements, one of which 
> will produce an error. For example:
> 
> options(error=recover)
> library(datasets)
> avg <- by(warpbreaks, list(warpbreaks$wool, warpbreaks$tnsion), 
> function(x)mean(x$breaks)))
> #previous line generates error due to typo
> print(avg)
> 
> 3. use C-p or C-r etc. to evaluate the paragraph.
> 4. RESULT: emacs becomes completely unresponsive.
> 
> This makes ESS darn near unusable for me. This can't be normal, can it?
> 
> I'm using ESS 5.5 with R 2.10.0 on both emacs 22.1.1 (OS X built in) and 
> Aquamacs (22.3.1).
> 
> Can anyone shed light?
> 
> Peter

What does "recover" do?  Does it mess with the prompt?  If so, then 
don't do it.  ESS will not like that.

Rodney