A symbol whose symbol-function is no longer to be traced.
When called with no arguments, it returns the symbols of all functions currently being traced. When called with one or more functions as arguments,
untrace returns a list of the symbols of those functions. Thus, in all situations,
untrace returns a list of the symbols of those functions being untraced.
untrace is used to cease the tracing of functions. If it is called with no arguments then the tracing of all currently traced functions is stopped. If it is called with one or more symbols then the tracing of those functions is stopped. A warning is given if
untrace is called with a function that is not being traced.
(untrace (clos:method foo (t)))
LispWorks User Guide and Reference Manual - 13 Feb 2015