Do not use "bind" to refer to both referencing and to assignment

[notriddle]

See https://users.rust-lang.org/t/difference-between-four-references/5406/7

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This change is

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @steveklabnik (or someone else) soon.

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[notriddle]

Just letting you know that the Travis CI error was from apt-get; it's not a problem with the pull request.

[steveklabnik]

@bors: r+ rollup

thank you!

[bors]

📌 Commit 63b5080 has been approved by steveklabnik