trace
(trace symbol)
Use the trace function for debugging. Each time the specified function is evaluated, trace information displays showing the entry of the function and the result of the function. Trace information is indented to the level of calling depth.
Use the untrace function to turn tracing of the specified function off.
Argument
symbol specifies a function name.
Return Value
The function returns the function name passed as argument.
If no argument is supplied, the function returns nil.
: (trace myfunc)
MYFUNC