can't trace recursive functions?

[Dave Dyer]

I typed in and compiled the standard definiion of FACT and try to trace it.

   (defun fact (a) (if (= a 0) 1 (* a (fact (1- a))))
  (compile 'fact)
  (trace fact)

results  in an internal error "debug-internals:make-breakpoint
FUNCTION-END breakpoints are unsupported for the known
return convention.