Enable core dumps: ulimit -c unlimited
Mutating functions require exclusive access:

https://twitter.com/simjp/status/928714602937905153
"Calling a mutating method on a value type is a write access that lasts for the duration of the method."
https://github.com/apple/swift-evolution/blob/master/proposals/0176-enforce-exclusive-access-to-memory.md#proposed-solution

TSan with SwiftPM: https://twitter.com/simjp/status/929140877540278272
Running TSan on CI: https://github.com/realm/SwiftLint/pull/1944
WIP Adding first-party support for tsan to SwiftPM: https://github.com/apple/swift-package-manager/pull/1390
SwiftPM Slack: https://swift-package-manager.herokuapp.com/

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