How find all usage (using emacs) some elisp function in all *.el files in Emacs?

Question

Emacs ver. 25.1.1

All emacs source files are in folder: ...\emacs\share\emacs\25.1\lisp\

Suppose I open in emacs file url.el. In this file has function url-retrieve. How I can found (using emacs) what another *.el files use this function?

Thanks.

Answer 1

You want to use xref-find-references (new in Emacs-25), which by default is bound to M-?.

It is meant to be generic, so it should work not only in Elisp, but in any major mode which provides support for xref.