src/google/protobuf/unknown_enum_test.proto

// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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// Definitions of protos for testing cross-version compatibility.  The
// UpRevision message acts as if it were a newer version of the DownRevision
// message.  That is, UpRevision shares all the same fields as DownRevision,
// but UpRevision can add fields and add enum values.
syntax = "proto2";

package google.protobuf.util;


message DownRevision {
  enum Enum {
    DEFAULT_VALUE = 2;
    NONDEFAULT_VALUE = 3;
  }

  optional Enum value = 1 [default = DEFAULT_VALUE];
  repeated Enum values = 2;
}

message UpRevision {
  enum Enum {
    DEFAULT_VALUE = 2;
    NONDEFAULT_VALUE = 3;
    NEW_VALUE = 4;
    NEW_VALUE_2 = 5;
    NEW_VALUE_3 = 6;
  }

  optional Enum value = 1 [default = DEFAULT_VALUE];
  repeated Enum values = 2;
}