tests/extensions/extensions.proto


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import 'alltypes.proto';

extend AllTypes {
    optional int32 AllTypes_extensionfield1 = 255 [default = 5];
}

message ExtensionMessage {
    extend AllTypes {
        optional ExtensionMessage AllTypes_extensionfield2 = 254;
        // required ExtensionMessage AllTypes_extensionfield3 = 253; // No longer allowed by protobuf 3
        repeated ExtensionMessage AllTypes_extensionfield4 = 252;
    }
    
    required string test1 = 1;
    required int32 test2 = 2;
}