While working on Kellnr, I updated the dependencies. It seems that the update of cargo breaks the build. I created an issue on github. Maybe somebody here has an idea for a simple fix.
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Looks like you got a solution. Here it is in case someone else has a similar problem elsewhere:
Running
cargo update --precise 0.2.9 cargo-util
should fix the issue.Good that this gets some visibility, looks like a frustrating thing to debug.
I had a similar issue with a different library. It would be nice for cargo to support a test build with minimum dependency versions.