compiler/testData/diagnostics/tests/cast/AsInCompoundAssignment.kt - third_party/github/JetBrains/kotlin - Git at Google

 // FIR_IDENTICAL
 class A {
     var b = 1
 }

 fun Any.test() {
     (this as A).b += 1 <!USELESS_CAST!>as Int<!>
 }
	// FIR_IDENTICAL
	class A {
	var b = 1
	}

	fun Any.test() {
	(this as A).b += 1 <!USELESS_CAST!>as Int<!>
	}