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We are not shipping a usable `csi` in 15.4 / 5.4.0.
> typeof (object)
> typeof (Object)
(1,9): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Runtime, Version=184.108.40.206, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
csharp> typeof (object)
csharp> typeof (Object)
👉 mono --version
Mono JIT compiler version 220.127.116.11 (2017-06/71277e78f6e Thu Sep 21 19:22:55 EDT 2017)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
Microsoft (R) Visual C# Interactive Compiler version 18.104.22.168919
Copyright (C) Microsoft Corporation. All rights reserved.
*** This bug has been marked as a duplicate of bug 58965 ***