Variable: abbrev-expand-function
abbrev-expand-function is a variable defined in abbrev.el.gz.
Value
abbrev--default-expand
Documentation
Function that expand-abbrev uses to perform abbrev expansion.
Takes no arguments, and should return the abbrev symbol if expansion took place.
Probably introduced at or before Emacs version 24.4.
Source Code
;; Defined in /usr/src/emacs/lisp/abbrev.el.gz
(defvar abbrev-expand-function #'abbrev--default-expand
"Function that `expand-abbrev' uses to perform abbrev expansion.
Takes no arguments, and should return the abbrev symbol if expansion
took place.")