#6035: reject multiple declarations of the same method or instance variable in the same object.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13756 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
#6035: reject multiple declarations of the same method or instance variable in the same object.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13757 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02