On Wed, Jul 13, 2016 at 5:20 AM, Evan James Patterson
<epatt...@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

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