1

The command (global-unset-key "\C-;") fails with the message: Invalid modifier in string.

Perhaps because of the special character ;. What is the proper way to unset this key?

Any other normal character works, e.g.: (global-unset-key "\C-c").

2

"\C-;" is not an ASCII character.

Try (global-unset-key (kbd "C-;")) or (global-unset-key [?\C-\;]).

See the Emacs manual, node Init Rebinding:

When the key sequence includes function keys or mouse button events, or non-ASCII characters such as C-= or H-a, you can use a vector to specify the key sequence...

See also the Elisp manual, node Ctl-Char Syntax.

  • BTW, the vector representation is [?\C-\;]. – xuchunyang Jun 13 '18 at 4:49
  • @xuchunyang: Yes, I was typing that while you commented. ;-) – Drew Jun 13 '18 at 4:53
  • The first one works: (global-unset-key (kbd "C-;")). – rph Jun 13 '18 at 5:08

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