bug#26027: (system vm trace) creates no output

[Mike Gran]

Hi-
I created the following file, which I ran under guile-2.0 and master.
There is no tracing output. What am I misunderstanding?
(use-modules 
(system vm trace)) 

(define (write-hi) 
(write "hi")) 

(define (outer) 
(write-hi)) 

(trace-calls-to-procedure write-hi) 
(trace-calls-in-procedure write-hi) 
(trace-instructions-in-procedure write-hi) 
(outer) 

Thanks,
Mike Gran