#Author : Steve Allen
#name : instance FShow#(poly#(td)) {....} endinstance
# --
instance FShow#(${1:type}#(td)) provisos( FShow#(td) );
    function Fmt fshow($1#(td) msg);
      return ($format("<${2:message} $1= %x ", msg.a)
              +
              fshow( msg.b )
              +
              $format(">"));
    endfunction
endinstance