=====================================
operator with arity (valid and supported by IEx.Helpers.h)
=====================================

::/2
@ / 1
& / 1

---

(source
  (binary_operator
    (operator_identifier)
    (integer)))

=====================================
map with identifiers
=====================================

%{a}
%{a, b}

---

(source
  (map
    (map_content
      (identifier)))
  (map
    (map_content
      (identifier)
      (identifier))))

=====================================
def with remote call
=====================================

def Mod.fun(x), do: 1

---

(source
  (call
    (identifier)
    (arguments
      (call
        (dot
          (alias)
          (identifier))
        (arguments
          (identifier)))
      (keywords
        (pair
          (keyword
            (atom_literal))
          (integer))))))

=====================================
[error] arrow outside of map
=====================================

a => b

---

(source
  (identifier)
  (ERROR
    (identifier)))