Describe the Bug

Exception in the generator when the user manually types in an attribute in their code:

Steps to Reproduce

Type [assembly: AssemblyInformationalVersion("1.0.0")] in source

Expected Behavior

Generator should be able to deal with duplicates

Exception with Stack Trace

System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)

Version Info

1.0.8