From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-42182-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 29710 invoked by alias); 29 Dec 2017 08:30:42 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
List-Unsubscribe: <mailto:zsh-workers-unsubscribe@zsh.org>
X-Seq: 42182
Received: (qmail 19810 invoked by uid 1010); 29 Dec 2017 08:30:41 -0000
X-Qmail-Scanner-Diagnostics: from mail-qt0-f182.google.com by f.primenet.com.au (envelope-from <schaefer@brasslantern.com>, uid 7791) with qmail-scanner-2.11 
 (clamdscan: 0.99.2/21882. spamassassin: 3.4.1.  
 Clear:RC:0(209.85.216.182):SA:0(-2.6/5.0):. 
 Processed in 6.131505 secs); 29 Dec 2017 08:30:41 -0000
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW,
	RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_PASS,T_DKIM_INVALID autolearn=ham
	autolearn_force=no version=3.4.1
X-Envelope-From: schaefer@brasslantern.com
X-Qmail-Scanner-Mime-Attachments: |
X-Qmail-Scanner-Zip-Files: |
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=brasslantern-com.20150623.gappssmtp.com; s=20150623;
        h=mime-version:from:date:message-id:subject:to;
        bh=pAxQhCwnTrXjQZ/whuWa7Og18gD9LcuF/nEInZ6C/xY=;
        b=Pl5ufJWjM4zwJKBU48sJVkO1bKj+YbIHWSm6NBFvLJFf/xfJ8coQJF6IM26qyTm5J9
         EvrGuHZ+5Pu5HvDngNbyk/ds0atkCeu8N4YklvDI5OuaZGa5rg3UuxdxOZDxOcmLd6Iq
         /Mba8TC4hbMuUXHz4guR+3mUuUP9zZ2dZNq395nudq2DCOwqDRm8Bv7pCGtsswS5aZ8t
         UlQIJfLkWURi59HET8NuuNhg5zmKp9v1ueDi7vIg6v8A2S6bJ7n73HYEmdtARmM3DEYC
         bOEoAK8oOMZpKHeGuveBr9FoGajCtX1Nu96EEolPxftOp3f27LkAp4UT295mcTTZHxiA
         1GPw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
        bh=pAxQhCwnTrXjQZ/whuWa7Og18gD9LcuF/nEInZ6C/xY=;
        b=oADnL19gnHQrV9+oy4j+tZKS9d4MgZrNaffRgUNFZixukVAqMUJIJ2JZ6fGMh5eHsv
         l6e/wQ/L6iHXsjLMKNSKffhm8q0MmO/KWAsH4/qRWWUe5imM1M/I8O8/hfb10ltVnHIb
         nkI/1CsIXtnb0kOpPhzoJn+0YVhXk4b51NxS1e8/QPNCDgUJEPWcZIxmqYjYHuYSOUzN
         vn/uFxEFMVgoq3+3mWiEEdWjwCnuly4va+gmxyugMfZsxvJ8RkT1G6VOvZg2yhyRb4S6
         GjfmWAb63HhQBekClVZZHqrOOGytJZypgyvXc1V+fNDLV3+bZS6SCsJe/Tl3lkpYxmmY
         FQyg==
X-Gm-Message-State: AKGB3mKEJ9wio9YWN18vHo1m9aNRf1/azOitMbU2DFUGFfvnF62FVR7V
	ULGTI9jY4zvkHY886U/tEgZLWNyR9NnwvD4Haw5TLg==
X-Google-Smtp-Source: ACJfBouSYFGR5LUoJWN1EAMWgFHiLI9mDZj/DmaTjFWnCFqiMOezqIBNvUA/ukScpeU/Ba4srbmbAgbEM5lmfmfLHpg=
X-Received: by 10.200.46.167 with SMTP id h36mr47898965qta.267.1514536232231;
 Fri, 29 Dec 2017 00:30:32 -0800 (PST)
MIME-Version: 1.0
From: Bart Schaefer <schaefer@brasslantern.com>
Date: Fri, 29 Dec 2017 00:30:31 -0800
Message-ID: <CAH+w=7bNy-66-v=QX2BDzkbJ5SadK7mVgd9joHGgF07364PV0w@mail.gmail.com>
Subject: How should empty aliases work?
To: Zsh hackers list <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

Documentation says that if an alias ends in a space, then the next
word is also subject to aliasing.

Consider:

% alias empty=''
% alias output='empty echo'
% alias echo='print -r bar'
% output foo

What should happen?  The doc would lead one to expect:
1. "output" expands to "empty echo"
2. "empty" expands to nothing
3. nothing does not end in a space, so the following word ("echo") is
not expanded
4. "echo foo" is executed

What actually happens is that "echo" expands and "print -r bar foo" is
executed.  If that's correct, can someone explain why?