From: bors <bors@rust-lang.org>
Date: Fri, 9 Mar 2018 19:40:03 +0000 (+0000)
Subject: Auto merge of #5126 - gilescope:cycle-error-message, r=alexcrichton
X-Git-Tag: archive/raspbian/0.35.0-2+rpi1~3^2^2^2^2^2^2^2~22^2~2^2~52
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Auto merge of #5126 - gilescope:cycle-error-message, r=alexcrichton

Error message for package "depends on itself" lists the packages in the cycle.

I got a cycle while trying to build someone else's code and cargo's error message didn't point me in the right direction, just mentioned there was a cycle. I thought we could be a bit more helpful.

Don't know what you think of {:#?} as the display but it seemed minimal code so I thought I'd start with that. I could compress the output to one package per line if preferred.
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