==================
procedure_forward_reference
==================

module

proc first() -> Int
return second() + 1

proc second() -> Int
return 41

end.

---

(source_file
  (module_declaration
    (procedure_declaration
      (identifier_definition
        (identifier))
      (parameter_list)
      (identifier)
      (procedure_body
        (return_clause
          (binary_expression
            (call_expression
              (identifier)
              (argument_list))
            (literal
              (integer))))))
    (procedure_declaration
      (identifier_definition
        (identifier))
      (parameter_list)
      (identifier)
      (procedure_body
        (return_clause
          (literal
            (integer)))))))