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<%filter Div($class)>
        <div class="<% $class %>">
                <% $yield->() %>
        </div>
</%filter>

% $.Div("row") {{
   1 The "$yield->()" method returns everything from here (free text)
...
                2 even could have another nested filter, etc...
%       }}
% }}

 
<div class="row">
    1 The "$yield->()" method returns everything from here (free text)
...
            2 even could have another nested filter, etc...   
   </div>
</div>

: macro div -> ($cls,$str) {
<div class="<: $cls :>">
        <: $str :>
</div>
: }

: div("row",
:       div("col",
:               "my string"
:       )
: )

:       div("col",
               nested
               here
:       )
: )