> infixr @@ 2
> infixr .> 3

Schl"usselwo"rter: |let x = 1 in x * x|, |fun (let x = 1 in x * x)|,
|let (a, b) = (b, a) in a * b|, |[let a=1 in a, let b=2 in b]|,
|let {a = 1; b = 2} in a * b|, |do {let a = 1; return (a * a)}|.
Listen: |[1,2,3] ++ [a]|.
