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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Sat, 28 Mar 2015 15:24:30 -0700
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Comments: In reply to Eric Cook <llua@gmx.com>
        "Re: [[ is being treated as a pattern in the command/reserved word position." (Mar 28,  5:55pm)
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	<55172355.80409@gmx.com>
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Subject: Re: [[ is being treated as a pattern in the command/reserved word position.
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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.