Swift has been used to write parts of MacOS that are used on Intel today.
The good faith efforts to write parts of a consumer OS in a garbage collected language that I can remember are Microsoft's effort to write Longhorn in C# and Google's effort to write part of Fuchsia in Go.
The good faith efforts to write parts of a consumer OS in a garbage collected language that I can remember are Microsoft's effort to write Longhorn in C# and Google's effort to write part of Fuchsia in Go.
Both efforts failed for performance reasons.