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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: find-function-source-directory
Date: Sun, 18 Feb 2018 21:35:30 +0200
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> Date: Sun, 18 Feb 2018 20:40:50 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> 
>   (setq find-function-source-path
>     '("c:/projects/emacs/lisp/"
>       "c:/projects/emacs/lisp/emacs-lisp/"
>       "c:/projects/emacs/lisp/net/"
>       ...))
> 
> (add more subdirectories instead of the ellipsis).

This notwithstanding, I think that doc string is misleading: what you
want to accomplish isn't possible, because find-function-source-path
cannot override load-path in this use case.  Or maybe I'm missing
something.