dabbrev--try-find
dabbrev--try-find is a compiled Lisp function in `dabbrev.el
'.
(dabbrev--try-find ABBREV REVERSE N IGNORE-CASE)
Search for ABBREV, backwards if REVERSE, N times.
If IGNORE-CASE is non-nil, ignore case while searching.
Return the expansion found, and save the location of the start
of the expansion in `dabbrev--last-expansion-location'.