Re: closure within closure, incorrect (?) byte-compiler warnings

[Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

>> You might want to `M-x report-emacs-bug` (and if so, please
>> put me in the `X-Debbugs-Cc:`).
>
> OK, I hope to do that soon ...

This sums it up ... three bugs?

;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;;   http://user.it.uu.se/~embe8573/emacs-init/geh.el
;;;   https://dataswamp.org/~incal/emacs-init/geh.el

(let ((data-item 1)
      (more-data 2) )
    (defun echo-data (&optional data)
      (interactive (list (read-number "number: " (or data-item more-data))))
      (message "data: %s" (or data data-item)) ))
;; (echo-data 5)
;; (echo-data)
;; (call-interactively #'echo-data)

;; Emacs bugs:
;;
;; 1. Byte compiler warnings (two cases) relating to the
;;    interactive spec:
;;
;;    geh.el:7:1: Warning: Unused lexical variable `more-data'
;;    geh.el:10:54: Warning: reference to free variable ‘data-item’
;;    geh.el:10:64: Warning: reference to free variable ‘more-data’
;;
;; 2. When the compiled version is used interactively:
;;
;;    Symbol's value as variable is void: data-item

-- 
underground experts united
https://dataswamp.org/~incal