===
Let
===

def foo :=
    let (x : bar := a)
        (y := x)
        (f (x : A) := x)
    in
        x
    end;

---

(program
  (definition
    (identifier)
    (expr
      (app_term
        (let
          (binding
            (identifier)
            (ascription
              (expr
                (app_term
                  (app
                    (term
                      (identifier))))))
            (expr
              (app_term
                (app
                  (term
                    (identifier))))))
          (binding
            (identifier)
            (expr
              (app_term
                (app
                  (term
                    (identifier))))))
          (binding
            (identifier)
            (param_block
              (identifier)
              (expr
                (app_term
                  (app
                    (term
                      (identifier))))))
            (expr
              (app_term
                (app
                  (term
                    (identifier))))))
          (expr
            (app_term
              (app
                (term
                  (identifier))))))))))