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structure IR = RefFun.Make(struct type t = int end) structure SR = RefFun.Make(struct type t = string end) fun main () = ir <- IR.new 3; ir' <- IR.new 7; sr <- SR.new "hi"; IR.write ir' 10; iv <- IR.read ir; iv' <- IR.read ir'; sv <- SR.read sr; IR.delete ir; IR.delete ir'; SR.delete sr; return <xml><body> {[iv]}, {[iv']}, {[sv]} </body></xml>