cl-defmethod not compatible with defmethod?

[Lars Ingebrigtsen]

If I have the following, everything works fine:

(defmethod initialize-instance :AFTER ((this registry-db) slots)

But I get a warning about defmethod being obsolete.

However, with the following:

(cl-defmethod initialize-instance :AFTER ((this registry-db) slots)

compilation stops with

gnus/nnregistry.el:34:1:Error: Unsupported qualifiers in function 
initialize-instance: (:AFTER)

when trying to require the file where that cl-defmethod is...

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