coding-system-charset-list
coding-system-charset-list is a compiled Lisp function in `mule.el
'.
(coding-system-charset-list CODING-SYSTEM)
Return list of charsets supported by CODING-SYSTEM.
If CODING-SYSTEM supports all ISO-2022 charsets, return `iso-2022'.
If CODING-SYSTEM supports all emacs-mule charsets, return `emacs-mule'.