On 25/12/2020 05:51, Tim Meehan wrote:
> I have used ",trace" before and get what it is supposed to do, but I am not
> sure what "trace-calls-to-procedure" is supposed to do ...
> 
> ;; Using Guile 3.0.4
> (use-modules (system vm trace))
> 
> (define (sqr x)
>      (* x x))
> 
> (trace-calls-to-procedure sqr)
> 
> (sqr 3)
> 
> ;; ... and nothing happens ... is something supposed to happen?
> 

trace-calls-to-procedure is a low-level trace procedure that returns a 
trap that you have to install in the trap state. You can either use the 
add-trap! procedure from (use-modules system vm trap-state), or use the 
add-trace-at-procedure-call! procedure from the same module.

That said, there seems to be a bug in add-trace-at-procedure-call! which 
I'm having a hard time figuring out... c'est la vie.

Vale
-Tim Van den Langenbergh