Re: emacs26, ucs-normalize.el, Symbol’s function definition is void: regexp-opt-charset

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Wed, 13 Feb 2019 15:15:25 -0500
> 
> Most likely regexp-opt gets loaded during the first run of "loadup", so
> the compilation of ucs-normalize by the initial bootstrap-emacs
> succeeds, even tough the compilation of that same file by the
> `emacs` fails.

Why is the first run of loadup different from the rest?  The condition
to load regexp-opt depends only on what functions were compiled into
the binary, not on anything else.