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Fix error message when resolving dependencies #6510
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Hmm, this looks like a crate version coherence problem.
The equivalent nightly build on Travis CI happily picks failure_derive v0.1.4: https://travis-ci.org/rust-lang/cargo/jobs/474305951. I'm not sure why there's a difference there either.
I'm not sure how to solve the issue, but it's obviously not caused by this PR.