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structure M = struct
datatype t = A | B
end
val f = fn x : M.t => case x of M.A => M.B | M.B => M.A
datatype t = datatype M.t
val g = fn x : t => case x of M.A => B | B => M.A
structure N = struct
datatype u = C of t | D
end
val h = fn x : N.u => case x of N.C x => x | N.D => M.A
datatype u = datatype N.u
val i = fn x : u => case x of N.C x => x | D => M.A
val toString = fn x =>
case x of
C A => "C A"
| C B => "C B"
| D => "D"
val rec page = fn x => return <xml><body>
{cdata (toString x)}<br/>
<br/>
<a link={page x}>Again!</a>
</body></xml>
val main : unit -> transaction page = fn () => return <xml><body>
<li> <a link={page (C A)}>C A</a></li>
<li> <a link={page (C B)}>C B</a></li>
<li> <a link={page D}>D</a></li>
</body></xml>
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