giving up calling 'datatype_compat' in a locale -- causes trouble with extensions
giving up calling 'datatype_compat' in a locale -- causes trouble with extensions

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle