bug#49507: 28.0.50; macOS: Symbol’s value as variable is void: lock-file-name-transforms

[Eli Zaretskii]

> From: Naofumi Yasufuku <naofumi@yasufuku.dev>
> Date: Sun, 11 Jul 2021 04:17:24 +0900
> Cc: 49507@debbugs.gnu.org
> 
> Lisp Backtrace:
> "write-region" (0xefbfdd58)
> "comp-run-async-workers" (0xefbfdf10)
> "native--compile-async" (0xefbfe180)
> "defalias" (0xefbfe250)
> "set-language-environment" (0xefbfeac8)
> "set-locale-environment" (0xefbfee88)
> "normal-top-level" (0xefbfef30)
> (gdb) s
> Symbol’s value as variable is void: lock-file-name-transforms

Any idea why Emacs needs to native-compile something at startup?
Which Lisp file does it native-compile here?