Add printer to the front of the list of pretty-printers for
object. The object must either be a <gdb:objfile> object,
or #f in which case printer is added to the global list of
printers.
Add printer to the end of the list of pretty-printers for
object. The object must either be a <gdb:objfile> object,
or #f in which case printer is added to the global list of
printers.