[Swift CI] Build Failure: OSS - Swift Package - Ubuntu 18.04 (master) #3082

# [FAILURE] oss-swift-package-linux-ubuntu-18_04 [#3082]

Build URL: https://ci.swift.org/job/oss-swift-package-linux-ubuntu-18_04/3082/
Project: oss-swift-package-linux-ubuntu-18_04
Date of build: Thu, 02 Jul 2020 23:47:21 -0500
Build duration: 1 hr 34 min

Identified problems:- Compile Error: This build failed because of a compile error. Below is a list of all errors in the build log:

Changes- Commit 23e797422a4ff6379d7308d70ffeeb04d4e05146 by hamishknight:

[CS] Avoid checking RHS of one-way constraint for reactivation

  • add: test/Constraints/rdar64890308.swift

  • edit: lib/Sema/ConstraintGraph.cpp

  • Commit 732698e268d8ba3cb532a2507022521be21bce3f by drexin:

    Fix symbol visibility test for CentOS 7

    • edit: test/stdlib/symbol-visibility-linux.test-sh
  • Commit e02438c260083a0ab1239b88ba7d1127bf10c002 by compnerd:

    test: repair the Windows builders after #32666

    • edit: test/Prototypes/BigInt.swift
  • Commit 28fb66cbaf706d0bcdc17153e32ac0e8cef57755 by github:

    [SR-13088] Fix false positive downcast unrelated of types that cannot be

    • edit: lib/Sema/ConstraintSystem.cpp
    • edit: lib/Sema/ConstraintSystem.h
    • edit: lib/Sema/CSBindings.cpp
    • edit: lib/Sema/CSDiagnostics.cpp
    • edit: lib/Sema/TypeCheckConstraints.cpp
    • edit: lib/Sema/TypeCheckProtocol.cpp
    • edit: include/swift/AST/Types.h
    • edit: lib/Sema/CSDiagnostics.h
    • edit: lib/Sema/CSSimplify.cpp
    • edit: lib/Sema/TypeChecker.h
    • edit: test/Constraints/casts.swift
    • edit: lib/AST/Type.cpp