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• Token+span

Change-token+span

Modifying constructor for token+span structures.

Syntax

(change-token+span x 
                   [:token <token>] 
                   [:span <span>]) 

This is an often useful alternative to make-token+span.

We construct a new token+span 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 fty::defprod.

Macro: change-token+span

(defmacro change-token+span (x &rest args)
  (std::change-aggregate 'token+span
                         x args
                         '((:token . token+span->token)
                           (:span . token+span->span))
                         'change-token+span
                         'nil))