Write a trace of all calls to the procedure proc to
(current-error-port).
Remove any active traces on the procedure proc.
Trace a specific environment cell.
Untrace an environment cell.
Remove all active procedure traces.
Write a trace of all calls to the procedure proc to
(current-error-port).
Remove any active traces on the procedure proc.
Trace a specific environment cell.
Untrace an environment cell.
Remove all active procedure traces.