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Created attachment 789 [details]
Microsoft (R) .NET Framework PE Verifier. Version 4.0.30319.1
Copyright (c) Microsoft Corporation. All rights reserved.
[token 0x02000004] Type load failed.
1 Error(s) Verifying bug-verifier.exe
Unhandled Exception: System.TypeLoadException: Method 'Base.Foo' on type 'Derived' from assembly 'bug-verifier, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' tried to implicitly implement an interface method with weaker type parameter constraints.