[Rd] "try"ing to understand condition handling

[hadley wickham]

> Since you have not told us what 'the documents' are (and only vaguely
> named one), do you not think your own documentation is inadequate?
>
> There are documents about the condition system on developer.r-project.org:
> please consult them.

Where exactly?

I tried:

 * reading http://developer.r-project.org/, but couldn't see anything
obvious, and there certainly isn't anything in the pointers section

 * using find on that page to search for "condition", "try"

 * using the google search with keywords: "condition system", "try catch", "try"

Perhaps you could provide a more explicit reference?

Hadley