================================================================================
Bitshift as expression
================================================================================
a := 10 << 2
--------------------------------------------------------------------------------

(source_file
  (simple_statement
    (var_declaration
      (expression_list
        (reference_expression
          (identifier)))
      (expression_list
        (binary_expression
          (literal
            (int_literal))
          (literal
            (int_literal)))))))

================================================================================
Bitshift as append statement
================================================================================
arr << 100
--------------------------------------------------------------------------------

(source_file
  (append_statement
    (reference_expression
      (identifier))
    (literal
      (int_literal))))
