(FUN
  f : (o -> o) -> o
  a : o
  g : o -> o
  h : o -> o
)
(VAR
  x : o
  z : o -> o
)
(RULES
  f(\x. z(x)) -> z(z(a)),
  g(x) -> h(x)
)
(COMMENT From Section 11.6.20 of \cite{TeReSe})