:eval-before
list-of-forms
This option allows you to supply a list of forms for evaluation upon entering the traced function. The forms are evaluated after printing out the arguments to the function, but unlike
:before
their results are not printed.
:eval-after
list-of-forms
This option allows you to supply a list of forms for evaluation upon leaving the traced function. The forms are evaluated after printing out the results of the function call, but unlike
:after
their results are not printed.
LispWorks User Guide and Reference Manual - 21 Dec 2011