[stephencanon]

FWIW, you can install Xcode 10.1 on High Sierra, and use the Swift.org 5.0 toolchain (https://swift.org/download/#snapshots) or build swift from source. You can't ship App Store apps this way, but it works great for experiments.

[igotsideas]

My machine is too old to upgrade to High Sierra.

[stephencanon]

https://support.apple.com/kb/SP765?locale=en_US

> MacBook Pro (Mid 2010 or newer)

So your 2011 should be supported. If it's actually an older machine, compiling from source is an option, if slightly inconvenient.

[igotsideas]

You're right. Downloading now. Thank you!