is true while delivering an image
on x86 platforms, delivery writes a file named
(the "zaps file") containing debug information about the symbols that were eliminated.
If an error occurs in the delivered image, the backtrace will contain a line of the form.
("SYMBOL-FUNCTION-VECTOR" nnn )
where nnn is an integer. The actual function name can be recovered from the zaps file by doing this in the LispWorks development image:
The numbers are unique to each image, so take care to use the zaps file that was produced at the same time as the delivered image.
LispWorks Delivery User Guide - 13 Dec 2011