If you add the ObfuscatorAttrs.cs to your project and then turn on the AntiILDASM setting, you get the following error when obfuscating.
----End of obfuscation C:\Temp\WindowsApplication11\bin\Release\ClassLibrary4.dll ------------
Total obfuscated members 20
Finish time:10:44:36 a.m.
Finish obfuscating project.
Verification of assemblies:
Results of C:\Temp\WindowsApplication11\Spices_output\ClassLibrary4.dll verification.
[MD] Error: TypeDef has a duplicate based on name+namespace, token=0x02000004, duplicate:token=0x0200000c.
[MD] Error: TypeDef has a duplicate based on name+namespace, token=0x0200000c, duplicate:token=0x02000004.
Is there a way around this?