DECLARE_flag       23 third_party/re2/util/flags.h #define DECLARE_bool(name) DECLARE_flag(bool, name)
DECLARE_flag       24 third_party/re2/util/flags.h #define DECLARE_int32(name) DECLARE_flag(int32, name)
DECLARE_flag       25 third_party/re2/util/flags.h #define DECLARE_string(name) DECLARE_flag(string, name)