[Rust] Builds are broken by rustyline on nightly 2019-05-16+

[asfimport]

Rust builds are broken on nightly since 2019-05-16. Please see kkawakam/rustyline#217

The issue might need to be fixed on the rustyline crate.

Reporter: Neville Dipale / @nevi-me
Assignee: Neville Dipale / @nevi-me

PRs and other links:

• GitHub Pull Request #4337

_{Note: This issue was originally created as ARROW-5360. Please see the migration documentation for further details.}

[asfimport]

Chao Sun / @sunchao:
Can we temporarily use an old nightly version (e.g., nightly-2019-05-15) to unblock the CI? We can always switch back to the latest nightly later after the issue is fixed.

[asfimport]

Wes McKinney / @wesm:
Let me know how you'd like to proceed – if there is no fix in the next few hours I'm going to move Rust to the "allow failures" section of Appveyor/Travis CI so PR/master builds don't appear to be failed

[asfimport]

Neville Dipale / @nevi-me:
The author and other contributors of the repo are on the line, I'm submitting a PR now, and will advise in the next 30 minutes if we've resolved this.

[asfimport]

Neville Dipale / @nevi-me:
I've submitted a PR: kkawakam/rustyline#219

[asfimport]

Chao Sun / @sunchao:
Issue resolved by pull request 4337
#4337