idea/testData/codeInsight/overrideImplement/overrideExtensionFunction.kt - third_party/github/JetBrains/kotlin - Git at Google

 open class A {
     open fun Int.foo(): Int {
         return 0
     }
 }

 class B: A() {
     <caret>
 }
	open class A {
	open fun Int.foo(): Int {
	return 0
	}
	}

	class B: A() {
	<caret>
	}