Line numbers with errors and warnings?

One thing that I do when I have a long script is to put "progress"
report messages.  These have some comments so I can chart the progress
and also print out the current CPU and memory usage so I can also
isolate where potential problems might be.  This will help narrow down
the section of code where the error occurred.  Are you also running
with

options(error=utils::recover)

so that when the error occurs, you get the stack and current
environment so that debugging is easier?

Is it possible to get a line number with an error report?

I have a long script and an error:

Error in `[.xts`(x, xsubset) : subscript out of bounds


It would be very helpful, and save a lot of time, if there was some
indication in the error message which line the error was.

I can find it using binary search but that is a painful process.

cheers
Worik

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