match_ident
if (match_ident(token, &_Static_assert_ident)) {
if (match_ident(token, &_Pragma_ident))
if (match_ident(token, &_Static_assert_ident)) {
if (match_ident(token, &_Pragma_ident))
if (match_ident(token->next, &once_ident) && eof_token(token->next->next)) {