c-nonlabel-token-key

c-nonlabel-token-key is a variable defined in `cc-engine.el'.
Its value is

nil

• Automatically becomes buffer-local when set.

Documentation:
Regexp matching things that can't occur in generic colon labels,
neither in a statement nor in a declaration context. The regexp is
tested at the beginning of every sexp in a suspected label,
i.e. before ":". Only used if `c-recognize-colon-labels' is set.