[jira] [Created] (ARROW-4189) [Rust] Fix broken cargo coverage

["Chao Sun (JIRA)" <ji...@apache.org>]

Chao Sun created ARROW-4189:
-------------------------------

             Summary: [Rust] Fix broken cargo coverage
                 Key: ARROW-4189
                 URL: https://issues.apache.org/jira/browse/ARROW-4189
             Project: Apache Arrow
          Issue Type: Test
          Components: Rust
            Reporter: Chao Sun


The Rust {{cargo coverage}} is failing with the following error:

{code}
warning: unused manifest key: package.edition
warning: unused manifest key: package.edition
...
error[E0432]: unresolved import `num`
  --> arrow/src/array_ops.rs:22:5
   |
22 | use num::Zero;
   |     ^^^ did you mean `std::num`?
error[E0432]: unresolved imports `self::csv_crate::StringRecord`, `self::csv_crate::StringRecordsIntoIter`
  --> arrow/src/csv/reader.rs:55:23
   |
55 | use self::csv_crate::{StringRecord, StringRecordsIntoIter};
   |                       ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^ no `StringRecordsIntoIter` in `csv`
   |                       |
   |                       no `StringRecord` in `csv`
error[E0432]: unresolved import `serde_derive`
  --> arrow/src/datatypes.rs:29:5
   |
29 | use serde_derive::{Deserialize, Serialize};
   |     ^^^^^^^^^^^^ maybe a missing `extern crate serde_derive;`?
error[E0432]: unresolved import `serde_json`
  --> arrow/src/datatypes.rs:30:5
   |
30 | use serde_json::{json, Value};
   |     ^^^^^^^^^^ maybe a missing `extern crate serde_json;`?
error[E0432]: unresolved import `libc`
  --> arrow/src/memory.rs:18:5
   |
18 | use libc;
   |     ^^^^ no `libc` in the root
error[E0432]: unresolved import `rand`
  --> arrow/src/util/test_util.rs:18:5
   |
18 | use rand::{thread_rng, Rng};
   |     ^^^^ maybe a missing `extern crate rand;`?
...
{code}

perhaps because it doesn't recognize Rust 2018 edition. 



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