# File lib/dep_selector/error_reporter/simple_tree_traverser.rb, line 29
      def give_feedback(dep_graph, soln_constraints, unsatisfiable_constraint_idx, most_constrained_pkg)
        unsatisfiable_soln_constraint = soln_constraints[unsatisfiable_constraint_idx]
        feedback = "Unable to satisfy constraints on package #{most_constrained_pkg.name}"
        feedback << ", which does not exist," unless most_constrained_pkg.valid?
        feedback << " due to solution constraint #{unsatisfiable_soln_constraint}. "

        all_paths = paths_from_soln_constraints_to_pkg_constraints(dep_graph, soln_constraints, most_constrained_pkg)
        collapsed_paths = collapse_adjacent_paths(all_paths).map{|collapsed_path| "[#{print_path(collapsed_path).join(' -> ')}]"}

        feedback << "Solution constraints that may result in a constraint on #{most_constrained_pkg.name}: #{collapsed_paths.join(', ')}"
      end