R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Create two R script files where one source():s the other
> # and both lists the traceback of filenames source():d.
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> path <- tempdir()
> pathnameA <- Arguments$getWritablePathname("foo.R", path=path)
> pathnameB <- Arguments$getWritablePathname("bar.R", path=path)
> 
> code <- 'cat("BEGIN foo.R\n")'
> code <- c(code, 'print(findSourceTraceback());')
> code <- c(code, sprintf('source("%s");', pathnameB))
> code <- c(code, 'cat("END foo.R\n")')
> code <- paste(code, collapse="\n")
> cat(file=pathnameA, code)
> 
> code <- 'cat("BEGIN bar.R\n")'
> code <- c(code, 'x <- findSourceTraceback();')
> code <- c(code, 'print(x);')
> code <- c(code, 'cat("END bar.R\n")')
> code <- paste(code, collapse="\n")
> cat(file=pathnameB, code)
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Source the first file
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> source(pathnameA, echo=TRUE)

> cat("BEGIN foo.R\n")
BEGIN foo.R

> print(findSourceTraceback())
$`D:/temp/Rtmp8qLLTh/foo.R`
[1] "D:/temp/Rtmp8qLLTh/foo.R"


> source("D:/temp/Rtmp8qLLTh/bar.R")
BEGIN bar.R
$`D:/temp/Rtmp8qLLTh/bar.R`
[1] "D:/temp/Rtmp8qLLTh/bar.R"

$`D:/temp/Rtmp8qLLTh/foo.R`
[1] "D:/temp/Rtmp8qLLTh/foo.R"

END bar.R

> cat("END foo.R\n")
END foo.R
> 
> proc.time()
   user  system elapsed 
   1.28   10.12   11.81