test/SILGen/variadic-subscript-single-arg.swift - third_party/swift - Git at Google

 // RUN: %target-swift-frontend -emit-silgen -verify %s

 struct Butt {
   subscript(butts: Int...) -> Int {
     return 0
   }
 }

 _ = Butt()[1]
	// RUN: %target-swift-frontend -emit-silgen -verify %s

	struct Butt {
	subscript(butts: Int...) -> Int {
	return 0
	}
	}

	_ = Butt()[1]