An efficient built-in mapcan

[gnu-emacs] / etc / NEWS

diff --git a/etc/NEWS b/etc/NEWS
index 5472dd84b7777cef72a9d441eab802d2d7591adb..6aef73a3c963c3d9f3b94c21d2ad47a552823232 100644 (file)
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -557,6 +557,9 @@ ABBR is a time zone abbreviation.  The affected functions are
 *** New basic face 'fixed-pitch-serif', for a fixed-width font with serifs.
 The Info-quoted and tex-verbatim faces now default to inheriting from it.
 
+** New built-in function `mapcan' which avoids unnecessary consing (and garbage
+   collection).
+
 \f
 * Changes in Emacs 25.2 on Non-Free Operating Systems