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Re: Bug#516998: zsh regards reserved word as candidate for alias substitution

X-seq: zsh-workers 26784
From: Clint Adams <schizo@xxxxxxxxxx>
To: Vincent Lefevre <vincent@xxxxxxxxxx>, 516998@xxxxxxxxxxxxxxx
Subject: Re: Bug#516998: zsh regards reserved word as candidate for alias substitution
Date: Wed, 25 Mar 2009 14:49:31 +0000
Cc: zsh-workers@xxxxxxxxxx
In-reply-to: <20090224231846.GA15279@xxxxxxxxxxxxxxxxxxx>
Mail-followup-to: Vincent Lefevre <vincent@xxxxxxxxxx>, 516998@xxxxxxxxxxxxxxx, zsh-workers@xxxxxxxxxx
Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
References: <20090224231846.GA15279@xxxxxxxxxxxxxxxxxxx>

On Wed, Feb 25, 2009 at 12:18:46AM +0100, Vincent Lefevre wrote:
> POSIX.1-2008 says[*]:
> 
>   2.3.1 Alias Substitution
>   [...] However, reserved words in correct grammatical context
>   shall not be candidates for alias substitution.
> 
> [*] http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03_01
> 
> but zsh gives:
> 
> vin% emulate sh
> vin% alias !="echo OK"
> vin% ! foo
> OK foo
> vin% 
> 
> instead of running command "foo". ksh93, pdksh, dash and bash
> in POSIX mode all behave correctly.

Where it seems that "correctly" means that setting the alias
succeeds, but ! is never substituted.

Follow-Ups:
- Re: Bug#516998: zsh regards reserved word as candidate for alias substitution
  - From: Peter Stephenson

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