test/IRGen/Inputs/objc_extension_base.swift - third_party/swift - Git at Google

 import gizmo

 open class SwiftBaseGizmo : Gizmo {
 }

 extension SwiftBaseGizmo {
   open override func frob() {}
 }
	import gizmo

	open class SwiftBaseGizmo : Gizmo {
	}

	extension SwiftBaseGizmo {
	open override func frob() {}
	}