c-make-bare-char-altc-make-bare-char-alt is a compiled Lisp function in `
cc-defs.el'. (c-make-bare-char-alt CHARS &optional INVERTED) Make a character alternative string from the list of characters CHARS. The returned string is of the type that can be used with `skip-chars-forward' and `skip-chars-backward'. If INVERTED is non-nil, a caret is prepended to invert the set.