[Rd] Nested tracing with custom callback

[Jeroen Ooms]

On Wed, Jul 13, 2016 at 5:20 AM, Evan James Patterson
<epatters at stanford.edu> wrote:
>
> I would like to install a trace function that gets executed whenever *any* R function is called. In Python, for example, this functionality is provided by the `sys.settrace` function.

Maybe you can adapt from the covr package:
https://github.com/jimhester/covr/blob/master/vignettes/how_it_works.Rmd