[jira] [Created] (ARROW-3960) [Rust] remove extern crate for Rust 2018

[Chao Sun (JIRA)]

Chao Sun created ARROW-3960:
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             Summary: [Rust] remove extern crate for Rust 2018
                 Key: ARROW-3960
                 URL: https://issues.apache.org/jira/browse/ARROW-3960
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
            Reporter: Chao Sun
            Assignee: Chao Sun


This is a trivial change to remove "extern crate" definitions in lib.rs, by 
following new format in Rust 2018.



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