Because of this code: ``` (CtlOp.Lt, CTree.Literal (VUInt n)) -> case tt of CTree.Postlude PTUInt -> S . TInteger <$> genUniformRM (0, fromIntegral n - 1) _ -> error "Cannot apply lt operator to target" ``` We can only apply rules like `uint .lt 2`. It forbids the following cases: ``` rule1 = nint .lt 2 rule2 = int .lt 2 rule3 = 1..5 .lt 2 rule4 = 1 .lt 2 rule5 = ((1..3) / (1..5)) .lt 2 ``` All these cases are accepted by the `cddl` tool. The same seems to happen with most of the other control operators.