Anders Lindgren <andlind@gmail.com> writes:

> In `shell.el', there are a number of face definitions on the form:
>
> (defface shell-highlight-undef-alias-face
>   '((t :inherit 'font-lock-variable-name-face))
>   "Face used for shell command aliases."
>   :group 'shell
>   :version "29.1")
>
> Note that `font-lock-variable-name-face' is quoted, which it shouldn't be.

I think these have been fixed on master, in commit b9ebacf40345.  We now
also warn for such cases, since commit 8d0c8076c3f2.  This will wait
until Emacs 31, however.

Could you please take a look and see if that resolves this problem?