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public class Example
public static void Main(string args)
Console.WriteLine(string.Join("\r\n", typeof(string).GetInterfaces().Select(i => i.Name)));
If you compile it to a binary and run it multiple times you always get a different ordering of the interfaces.
csharp repl won't reproduce the bug, running it straight with mono will.
Fixed in mono master/4.2 branch.
Thanks for the report.