Ever wondered why Cargo selects the *newest* versions of crates? Or what that might have to do with putting compiler versions in Cargo.toml? Well I have just the blog post for you: 
http://aturon.github.io/2018/07/25/cargo-version-selection/ …
"Note first that Rust toolchains are regularly tested against the entire http://crates.io ecosystem" I really wish we'd stop claiming this is true.
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Say more? I realize there are caveats, but this is a major part of the work the Release Team does on a regular basis.
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I think it's misleading to say "the entire http://crates.io ecosystem" when it doesn't even include the 10 most downloaded crates. Anything that: - Is windows specific - Requires at least one feature enabled - Requires system libraries is not tested.
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