compiler/testData/psi/DoubleColonWhitespaces.kt - third_party/github/JetBrains/kotlin - Git at Google

 fun tests() {
     a:: b
     a ::b
     a :: b

     a?:: b
     a ?::b
     a ?:: b
     a? ::b
     a ? :: b
     a ? ? :: b
 }

 fun breakLine() {
     a?
     ::b
 }
	fun tests() {
	a:: b
	a ::b
	a :: b

	a?:: b
	a ?::b
	a ?:: b
	a? ::b
	a ? :: b
	a ? ? :: b
	}

	fun breakLine() {
	a?
	::b
	}