[Swift CI] Build Failure: 0. OSS - Swift Incremental RA - Ubuntu 16.10 (master) #2099

This has been failing intermittently for a while.

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On Dec 21, 2017, at 12:25 PM, swift-ci@swift.org wrote:

[FAILURE] oss-swift-incremental-RA-linux-ubuntu-16_10 [#2099]

Build URL: https://ci.swift.org/job/oss-swift-incremental-RA-linux-ubuntu-16_10/2099/
Project: oss-swift-incremental-RA-linux-ubuntu-16_10
Date of build: Thu, 21 Dec 2017 14:03:33 -0600
Build duration: 22 min
Identified problems:

Compile Error: This build failed because of a compile error. Below is a list of all errors in the build log:
Indication 1
Tests:

Name: Swift(linux-x86_64)
Failed: 0 test(s), Passed: 10129 test(s), Total: 10129 test(s)
Name: Swift-Unit
Failed: 0 test(s), Passed: 498 test(s), Total: 498 test(s)

Changes

Commit fc253e8a23c1b79459e8691d3515b6afc19ebc3c by dgregor:
[Stdlib] Fix requirements on FlattenCollectionIndex.

edit: validation-test/stdlib/Lazy.swift.gyb
edit: stdlib/public/core/Flatten.swift