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Backref

Change-backref

Modifying constructor for backref structures.

Syntax

(change-backref x 
                [:loc <loc>] 
                [:len <len>])

This is an often useful alternative to make-backref.

We construct a new backref structure that is a copy of x, except that you can explicitly change some particular fields. Any fields you don't mention just keep their values from x.

Definition

This is an ordinary change- macro introduced by defprod.

Macro: change-backref

(defmacro change-backref (x &rest args)
  (std::change-aggregate 'backref
                         x args
                         '((:loc . backref->loc)
                           (:len . backref->len))
                         'change-backref
                         'nil))