" id="frame-source-<%= error_index %>-<%= index %>">

Extracted source (around line #<%= source_extract[:line_number] %>):

                <% source_extract[:code].each_key do |line_number| %>
<%= line_number -%>
                <% end %>

<% source_extract[:code].each do |line, source| -%>"><%= source -%><% end -%>