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path: root/Test/test21/Orderings4.bpl
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type Wicket;

const unique r: Wicket;
const unique s, t: Wicket extends unique r;

procedure P() returns () {
  assert (forall x:Wicket, y:Wicket :: x <: s && y <: t ==> x != y);
  assert false;          // unprovable
}