x.RC.__postblit () is not callable using argument types () const

[Dan]

I've seen these type of errors often and usually the cause kind 
of jumps out. In this case I'm totally confused. Just trying to 
move from 2.06 to 2.061.

The code is: http://dpaste.dzfl.pl/f40e4d6f
and fails with the error in subject line. Observations:

- If "static if(1)" is changed to "static if(0)" it compiles
- If either _valuationHistory or goo member of BSItem is 
commented out it compiles.

I know the code is somewhat cryptic, but I've been using binary 
reduction comment in/out to try to narrow down this issue. I can 
not understand why an introduction of opEquals on a struct 
History with no relationship to RC causes an error to show for RC.

Thanks
Dan