25.7.2 Macroexpansion in the stepper

To macroexpand a macro form before reaching it in the Stepper, position the cursor at the start of the macro form and choose the menu command Debug > Stepper > Macroexpand or click in the Stepper toolbar. You can only this when the Stepper has already stepped the function.

Sometimes it is useful to expand macros in outer forms, to allow the more detailed stepping of their expansions. For example, for a definition such as

(defstruct foo (x (print 10)) y)

when stepping


expanding the defstruct form allows you to step more of the constructor.

Common LispWorks User Guide (Windows version) - 21 Feb 2008