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So: have there been changes to eieio (specifically, cl-defmethod) in Emacs 27 that break previous code? It's not a change in eieio or cl-defmethod directly; what's changed is the handling of the &key symbol in cl-def* macros. (cl-defmethod initialize-instance :after ((sc simple-class) &key)) In Emacs 26 and earlier this produces a function which ...

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