def informs the system that any definitions within body should be recorded as being within the dspec dspec. This means that when something attempts to locate such a definition, it should look for a definition named dspec.
def to wrap a group of definitions so that source location for one of the group causes the LispWorks Editor to look for the dspec in the
def instead. Typically you will also need a define-form-parser definition for the macro that expands into the
You can also use
def to provide a dspec for a definition that has its own class that has been defined with define-dspec-class. In this case, you arrange to call record-definition with the same dspec as in the example below.
It is also possible to mix these cases, recording a dspec and also grouping inner definitions. For example
defstruct does this, recording itself and also grouping definitions such as the constructor function.
In all cases, to make source location work in the LispWorks editor you typically also need a define-form-parser definition for the macro that expands into the
LispWorks User Guide and Reference Manual - 20 Sep 2017