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internal partial class JsonContext : JsonSerializerContext
{
public static JsonContext Default { get; }
public JsonTypeInfo<JsonMessage> JsonMessage { get; }
public JsonContext(JsonSerializerOptions options) { }
public override JsonTypeInfo GetTypeInfo(Type type) => ;
}
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using System;
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}