Commits on Oct 7, 2019

1. Improve error message for cyclic dependencies …

   First reported in rust-lang/rust#65014 it looks like our error message
   on cyclic dependencies may be confusing at times. It looks like this is
   an issue because there are multiple paths through a graph for a
   dependency, so using the generic `path_to_top` function isn't producing
   the most useful path for this purpose.
   
   We're already walking the graph though, so this commit adds an extra
   parameter which collects the list of packages we've visited so far to
   produce a hopefully always-accurate error message showing the chain of
   dependencies end-to-end for what depends on what.

   

   alexcrichton committed Oct 7, 2019
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