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Date: Thu, 2 Jun 2016 17:05:08 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: zsh-workers@zsh.org
Subject: $functions: failed to find end of command substitution
Message-ID: <20160602170341.GA14533@fujitsu.shahaf.local2>
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$ zsh -f
% f() {                             
  : $(:)
  "↓"
}
% : $functions
zsh: failed to find end of command substitution
% 

It doesn't happen if I change "↓" (U+2193) to "→" (U+2192).