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I made a layout with some slightly ugly code for making rounded boxes with CSS and HTML, and wanted a way to automate the boxes. I had thought of having two functions to print starting and ending code, but this seems nicer. This goes with the other application helpers:
def rounded_box(&block) concat 'This goes in a view:', block.binding end' + capture(&block) + '
<% rounded_box do %> ... stuff to put in the rounded box ... <% end %>