Update printing of custom index operators
Update printing of custom index operators

eliberis/ocaml,eliberis/ocaml,eliberis/ocaml,eliberis/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,msprotz/ocaml,yunxing/ocaml,msprotz/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,yunxing/ocaml,eliberis/ocaml,yunxing/ocaml,gerdstolpmann/ocaml