ref ofthen(int n)
  if(0)
    isit = 42
  else
    maybenot = 667
  end
end
-- -- --
s(:expressions,
  s(:function, :ref,
    s(:name, :ofthen),
    s(:parameters,
      s(:field, :int, :n)),
    s(:expressions,
      s(:if,
        s(:condition,
          s(:int, 0)),
        s(:if_true,
          s(:assign,
            s(:name, :isit),
            s(:int, 42))),
        s(:if_false,
          s(:assign,
            s(:name, :maybenot),
            s(:int, 667)))))))