From: bors <bors@rust-lang.org>
Date: Tue, 12 Dec 2017 05:41:53 +0000 (+0000)
Subject: Auto merge of #4806 - alexcrichton:fix-infinite-loop, r=matklad
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Auto merge of #4806 - alexcrichton:fix-infinite-loop, r=matklad

Fix an infinite loop in error reporting

The `path_to_root` function unfortunately didn't account for cycles in the
dependency graph introduced through dev-dependencies, so if a cycle was present
then the function would infinitely loop pushing items onto a vector.

This commit fixes the infinite loop and also touches up the reporting to be a
little more consistent with the rest of Cargo
---

bc9ffdf66fe0796b83585d09519a3beecd9a079d