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The Runtime for the Flabbergast Configuration Language on the JVM.

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package flabbergast;

import java.io.IOException;
import java.io.Writer;
import java.util.Set;

/**
 * A stack element that bifurcates.
 *
 * These are typical of instantiation and attribute overriding that have both a
 * container and an ancestor.
 */
public class JunctionReference extends BasicSourceReference {
    private SourceReference junction;

    public JunctionReference(String message, String filename, int start_line,
                             int start_column, int end_line, int end_column,
                             SourceReference caller, SourceReference junction) {
        super(message, filename, start_line, start_column, end_line,
              end_column, caller);
        this.junction = junction;
    }

    /**
     * The stack trace of the non-local component. (i.e., the ancestor's stack
     * trace).
     */
    public SourceReference getJunction() {
        return junction;
    }

    @Override
    public void write(Writer writer, String prefix, Set seen)
    throws IOException {
        writer.write(prefix);
        writer.write(this.caller == null ? "└─┬ " : "├─┬ ");
        writeMessage(writer);
        boolean before = seen.contains(this);
        if (before) {
            writer.write(" (previously mentioned)");
        } else {
            seen.add(this);
        }
        writer.write("\n");

        if (before) {
            writer.write(prefix);
            writer.write(caller == null ? "  " : "┊ ");
            writer.write("┊\n");
        } else {
            junction.write(writer, prefix + (caller == null ? "  " : "│ "),
                           seen);
            if (caller != null) {
                caller.write(writer, prefix, seen);
            }
        }
    }
}