class Psych::Visitors::YAMLTree

def accept target
  # return any aliases we find
  if @st.key? target
    oid         = @st.id_for target
    node        = @st.node_for target
    anchor      = oid.to_s
    node.anchor = anchor
    return @emitter.alias anchor
  end
  if target.respond_to?(:encode_with)
    dump_coder target
  else
    send(@dispatch_cache[target.class], target)
  end
end