22.01.2014, 02:47, "Robert P. Goldman" <[email protected]>:
> Fixes for this error should look something like this:
>
> (defclass my-operation (OPERATION)
>   ...)
>
> should turn into something like
>
> (defclass my-operation (#-asdf3 OPERATION #+asdf3 DOWNWARD-OPERATION)
>   ...)
>
[...]
> FWIW, *all* the OPERATION-redefining systems will be broken.  This is 
> intentional.  All such systems need reexamination, and potentially patching.

Have you considered leaving old asdf:operation as a deprecated backward 
compatibility stub defined as

  (defclass operation (downward-operation) ())

And the hierarchy base class will be called for example base-operation:

  (defclass base-operation ()    )
 
  (defclass downward-operation (base-operation)    )
  (defclass upward-operation (base-operation)    )
  (defclass sideway-operation (base-operation)    )
  (defclass selfward-operation (base-operation)    )
  (defclass non-propagating-operation (base-operation)   )

Best regards,
- Anton


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