7.9.2 The editor's implicit form parser

When testing your form parsers bear in mind that the LispWorks editor has an implicit form parser, independent of explicit parsers defined in the dspec system. It tries to parse a dspec from a top level form which is of length 2 or more and whose car has symbol name beginning with "DEF" . That is:

(defxyz name forms )

gets parsed as

(defxyz name )

which may be a dspec (and thus provides a match for the source location commands). This mechanism operates only when there's no explicit parser defined for defxyz .

The editor's implicit form parser is useful because it matches a common simple case. However it does not work for the parameterdef example, because that definer's symbol name does not begin with "DEF" .

LispWorks User Guide - 8 Apr 2005