EDITION_PROTO2 constant
Edition
const EDITION_PROTO2
Legacy syntax "editions". These pre-date editions, but behave much like distinct editions. These can't be used to specify the edition of proto files, but feature definitions must supply proto2/proto3 defaults for backwards compatibility.
Implementation
static const Edition EDITION_PROTO2 =
Edition._(998, _omitEnumNames ? '' : 'EDITION_PROTO2');