Patch from Gerd Moellmann to bring error detection of defclass in line
with ANSI requirements: o If there are any duplicate slot names, an error of type program-error is signaled. o If an initialization argument name appears more than once in :default-initargs class option, an error of type program-error is signaled. o If any of the following slot options appears more than once in a single slot description, an error of type program-error is signaled: :allocation, :initform, :type, :documentation.
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