==================
pointer_subtraction
==================

module

proc test(a, b: ^Char) -> Int
return a - b

end.

---

(source_file
  (module_declaration
    (procedure_declaration
      (identifier_definition
        (identifier))
      (parameter_list
        (field_declaration
          (field_identifier
            (identifier))
          (field_identifier
            (identifier))
          (pointer_type
            (identifier))))
      (identifier)
      (procedure_body
        (return_clause
          (binary_expression
            (identifier)
            (identifier)))))))