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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=22.214.171.124, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
csharp> typeof (object)
csharp> typeof (Object)
👉 mono --version
Mono JIT compiler version 126.96.36.199 (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 188.8.131.52919
Copyright (C) Microsoft Corporation. All rights reserved.
*** This bug has been marked as a duplicate of bug 58965 ***