let x = 
      y
    z = 
      w
in x

let x = 
      y
    z = 
      w
in x

a = 
  let x = 
        y
      z = 
        w
  in x

a = 
  let x = 
        y
      z = 
        w
  in x

let x = 
      y
    z = 
      w
in x

let z = 
      w
in x

a = 
  let z = 
        w
  in x

a = 
  let z = 
        w
  in x

f x = 
  let g x = 
        5
      g x = 
        5
  in 3

f = 
  let y = 
        z
  in z

f x = 
  let y = 
        z
  in z