[ghthor]

The standard go cli toolchain comes with `go fix which was used to do the update code for breaking changes or styles during the time before 1.0 release. If anything, I suspect the swift team was partially inspired by this pattern.

[zapzupnz]

I doubt it. Apple's refactoring tools in Xcode go way back, thanks to the introduction of Carbon; the Intel transition; synthesised properties and automatic reference counting in Objective-C 2; and the extremely regular, breaking changes in UIKit.