[Agda] Mutual clause

[Leonardo Rodriguez]

I'm trying to write mutual recursive functions using the "mutual" clause.
But
when Agda loads the program, the operators ↓≤ and ↑≤  are hightlighted in
orange and
the "Checked" message does not appear. What's the problem?

mutual
  _↓≤_ : Simple -> Simple -> Bool
  ...definition uses ↑≤...

  _↑≤_ : Type -> Type -> Bool
  ...definition uses ↓≤...

Thanks you in advance
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