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Date: Sat, 28 Mar 2015 19:07:05 -0400
From: Eric Cook <llua@gmx.com>
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Subject: Re: [[ is being treated as a pattern in the command/reserved word
 position.
References: <55171842.7030505@gmx.com> 	<150328144428.ZM5583@torch.brasslantern.com> 	<55172355.80409@gmx.com> <150328152430.ZM18574@torch.brasslantern.com> <6862591427582011@web25h.yandex.ru>
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On 03/28/2015 06:33 PM, ZyX wrote:
> 29.03.2015, 01:25, "Bart Schaefer" <schaefer@brasslantern.com>:
>> On Mar 28,  5:55pm, Eric Cook wrote:
>> }
>> } % print $ZSH_PATCHLEVEL; emulate sh -c '[[ a == a ]]'
>> } zsh-5.0.7-362-gab40656
>> } zsh: command not found: [[
>> }
>> } Did that behavior change?
>>
>> Aha.  That makes more sense.
>>
>> The '[[' reserved word is handled a special kind of built-in alias [*]
>> and the change to POSIX_ALIASES handling caused that to be disabled.
>>
>> This will take a bit of thought.
>>
>> [*] Not literally, but the alias expansion code is where '[[' is noted
>> and the lexer changed into "parsing a conditional" state.
> I would say that this is actually an expected behaviour: `posh -c '[[ a == a ]]'` will show `posh: [[: not found` because `[[` is not in POSIX. Similar error will be shown by dash.
Nor is it disallowed by POSIXand it used to work, the bug report is
still valid.