try-complete-lisp-symbol

try-complete-lisp-symbol is a compiled Lisp function in `hippie-exp.el'.

(try-complete-lisp-symbol OLD)

Try to complete word as an Emacs Lisp symbol.
The argument OLD has to be nil the first call of this function, and t
for subsequent calls (for further possible completions of the same
string). It returns t if a new completion is found, nil otherwise.