[Voted into WP at April, 2006 meeting.]

Proposed resolution (October, 2005):

Change the grammar in 9.7.1 [dcl.enum] paragraph 1 as indicated:

enum-specifier:

enum identifier_opt { enumerator-list_opt }

enum identifier_opt { enumerator-list , }

The C language (since C99), and some C++ compilers, accept:

    enum { FOO, };

as syntactically valid. It would be useful

• for machine generated code

• for minimising changes when editing

• to allow a distinction between the final item being intended as an ordinary item or as a limit:

  enum { red, green, blue, num_colours };  // note no comma
  enum { fred, jim, sheila, };             // last is not special

This proposed change is to permit a trailing comma in enum by adding:

enum identifier_opt { enumerator-list , }

as an alternative definition for the enum-specifier nonterminal in 9.7.1 [dcl.enum] paragraph 1.