My pull request failed to build:
The build failure is entirely unrelated to my changes; it looks like whatever point the branch was taken from/built from, the underlying swift implementation is broken:
https://ci.swift.org/job/swift-corelibs-foundation-PR-Linux/455/
In file included from /home/buildnode/jenkins/workspace/swift-corelibs-foundation-PR-Linux@2/swift/include/swift/SIL/SILFunction.h:20:
In file included from /home/buildnode/jenkins/workspace/swift-corelibs-foundation-PR-Linux@2/swift/include/swift/SIL/SILBasicBlock.h:21:
<>/home/buildnode/jenkins/workspace/swift-corelibs-foundation-PR-Linux@2/swift/include/swift/SIL/SILInstruction.h:80:16: error: no template named 'ilist_sentinel_traits' in namespace 'llvm'; did you mean 'ilist_sentinel_tracking'?
friend llvm::ilist_sentinel_traits<SILInstruction>;
~~~~~~^~~~~~~~~~~~~~~~~~~~~
ilist_sentinel_tracking
/home/buildnode/jenkins/workspace/swift-corelibs-foundation-PR-Linux@2/llvm/include/llvm/ADT/ilist_node_options.h:25:47: note: 'ilist_sentinel_tracking' declared here
template <bool EnableSentinelTracking> struct ilist_sentinel_tracking {};
^