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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Sun, 15 Nov 2015 19:24:07 -0800
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
        "Re: Bug in alias expansion" (Nov 16,  1:50am)
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: Bug in alias expansion
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On Nov 16,  1:50am, Mikael Magnusson wrote:
} Subject: Re: Bug in alias expansion
}
} > In older versions of zsh it gagged in a different way:
} >
} > % alias -g foo='echo x)$(:'
} > % print $(foo)
} > zsh: parse error near `)'
} > zsh: parse error in command substitution
} 
} This error is definitely what I would expect from the above command.
} It's expanded in the subshell

If this were a normal command alias, I'd agree with you, but this is
a global alias -- the parent shell should expand it wherever it is an
unquoted shell word in the original command line, before the subshell
is ever started.

The "workaround" I posted in 37122 behaves the way you're thinking,
but shouldn't be necessary.

I suppose there's an argument to be made that a word inside $(...) is
"quoted", but if so. the example I showed for "typeset frobozz[$(foo)]"
(where xyz is expanded before parse_subscript() is called) must be
wrong.