1 files changed, 11 insertions, 0 deletions
diff --git a/discocaml/draw_tree.ml b/discocaml/draw_tree.ml
index 16719df..f0badd7 100644
--- a/discocaml/draw_tree.ml
+++ b/discocaml/draw_tree.ml
@@ -88,13 +88,24 @@ let draw_tree (ast : expr ast) : string =
   let fmt = Format.formatter_of_buffer buf in
   Format.fprintf fmt "digraph {\n";
   Format.fprintf fmt "  node [shape=\"box\", style=\"rounded\"];\n";
+
   add_expr_edges ast fmt nodes ast.root;
   Format.fprintf fmt "\n";
+
   IntSet.iter
     (fun index ->
       let i = { index } in
       add_node fmt i (get_subexpr ast i))
     !nodes;
+
+  get_binders ast
+  |> Array.iteri (fun i -> function
+       | Some j ->
+           Format.fprintf fmt
+             "  expr%d -> expr%d_var [color=\"#cccccc\", constraint=false];\n" i
+             j.index
+       | None -> ());
+
   Format.fprintf fmt "}\n";
   Format.pp_print_flush fmt ();
   Buffer.contents buf