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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <141123115755.ZM10874@torch.brasslantern.com>
Date: Sun, 23 Nov 2014 11:57:55 -0800
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
 "Re: BUG: failure in "vcs_info prompt" aborts precmd function" (Nov 23,
 7:08pm)
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To: zsh workers <zsh-workers@zsh.org>
Subject: TRY_BLOCK_ERROR and exit status
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On Nov 23,  7:08pm, Mikael Magnusson wrote:
}
} % { $(< foo) } always { TRY_BLOCK_ERROR=0 }; echo hello
} zsh: no such file or directory: foo
} hello
} 
} However, I'm not sure how to
} make the construct return false when it failed with a fatal error.

Arguably a fatal error should set both errflag and lastval nonzero, but
that might require a lot of tiny changes all over the place ... on the
other hand I think always+TRY_BLOCK_ERROR is the only way lastval can
still be examined after errflag has been set, so maybe it would suffice
to handle this there?

What should the value of lastval ($?) be in this circumstance?