tests/sort_by_tag/sort_by_tag.proto

syntax = "proto3";

message Unsorted
{
    uint32 first = 99;
    oneof oneof {
        uint32 second = 80;
        uint32 third = 50;
    }
    uint32 last = 1;
}

message Sorted
{
    uint32 first = 99;
    oneof oneof {
        uint32 second = 80;
        uint32 third = 50;
    }
    uint32 last = 1;
}