21.2.2 Invoking the stepper via a breakpoint

1. Compile and load the code in the system demo defined in the LispWorks library file examples/tools/demo-defsys.lisp
2. Open the file examples/tools/demo-utils.lisp in an Editor and set a breakpoint at the call to + as described in Breakpoints.
3. In a Listener, enter (my-useful-function 42) .
4. A Stepper tool appears, with the current stepping position at the breakpoint.

 


5. You can now step this code, just as in standalone mode.
6. When you choose Stepper > Continue , or otherwise finish stepping, my-useful-function returns, the Stepper is hidden and the Listener tool becomes active again.