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bug#39919: 26.3; Incorrect byte-compiler warning


From: Mike Woolley
Subject: bug#39919: 26.3; Incorrect byte-compiler warning
Date: Wed, 4 Mar 2020 23:18:07 +0000

Compiling this minimal test:

;; -*- lexical-binding: t -*-

(dotimes (i 10 t)
    (prin1 i))

Gives the incorrect warning: "Unused lexical variable ā€˜iā€™ā€, even though `i' is 
clearly used inside the loop.

However the following version (dropping the [result] form from `dotimes') does 
not give the warning:

(dotimes (i 10)
    (prin1 i))

This would seem like a bug to me.
Please advise?

Thanks,
Mike



In GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.2.0, NS appkit-1671.20 
Version 10.14.3 (Build 18D109))
 of 2019-09-02 built on builder10-14.porkrind.org
Windowing system distributor 'Apple', version 10.3.1894
Recent messages:
Undo!
next-line: End of buffer [2 times]
Mark set [2 times]
auto trimmed 0 chars
Saving file /Users/mike/tmp/test.el...
Wrote /Users/mike/tmp/test.el
Mark saved where search started
Saving file /Users/mike/tmp/test.el...
Wrote /Users/mike/tmp/test.el
Type "q" to restore previous buffer. [3 times]
previous-line: Beginning of buffer [2 times]
Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
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Configured features:
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Important settings:
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Major mode: Emacs-Lisp

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Load-path shadows:
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Memory information:
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