R Under development (unstable) (2025-04-29 r88182 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> 
> library(winch)
> 
> foo <- function() {
+   winch_call(bar)
+ }
> 
> bar <- function() {
+   purrr::map(1, ~ baz())
+ }
> 
> baz <- function() {
+   winch_call(boo)
+ }
> 
> boo <- function() {
+   winch_add_trace_back()
+ }
> 
> if (winch_available() && requireNamespace("purrr")) {
+   tryCatch(foo(), error = identity)
+ }
Loading required namespace: purrr
[[1]]
     ▆
  1. ├─base::tryCatch(foo(), error = identity)
  2. │ └─base (local) tryCatchList(expr, classes, parentenv, handlers)
  3. │   └─base (local) tryCatchOne(expr, names, parentenv, handlers[[1L]])
  4. │     └─base (local) doTryCatch(return(expr), name, parentenv, handler)
  5. └─global foo()
  6.   └─winch::winch_call(bar)
  7.     └─`/winch.dll`::register_frame_ctor()
  8.       └─global `<fn>`()
  9.         └─purrr::map(1, ~baz())
 10.           └─purrr:::map_("list", .x, .f, ..., .progress = .progress)
 11.             ├─purrr:::with_indexed_errors(...)
 12.             │ └─base::withCallingHandlers(...)
 13.             └─purrr:::call_with_cleanup(...)
 14.               └─`/purrr.dll`::register_frame_ctor()
 15.                 └─`/purrr.dll`::register_frame_ctor()
 16.                   └─.f(.x[[i]], ...)
 17.                     └─global baz()
 18.                       └─winch::winch_call(boo)
 19.                         └─`/purrr.dll`::register_frame_ctor()
 20.                           └─`/purrr.dll`::register_frame_ctor()
 21.                             └─`/purrr.dll`::register_frame_ctor()
 22.                               └─`/winch.dll`::register_frame_ctor()
 23.                                 └─global `<fn>`()

Warning message:
`winch_add_trace_back()` was deprecated in winch 0.1.0. 
> 
> proc.time()
   user  system elapsed 
   0.42    0.09    0.51