[Tests] Make sure desugaring works with context receivers

compiler/testData/codegen/box/extensionFunctions/contextReceivers/unaryOperators.kt

@@ -0,0 +1,45 @@
+// !LANGUAGE: +ContextReceivers
+// TARGET_BACKEND: JVM_IR
+// IGNORE_BACKEND_FIR: JVM_IR
+
+data class Result(val i: Int)
+
+var operationScore = 0
+
+context(Int)
+operator fun Result.unaryMinus(): Result {
+    operationScore += this@Int
+    return Result(-i)
+}
+
+context(Int)
+operator fun Result.unaryPlus(): Result {
+    operationScore += this@Int
+    return Result(if (i < 0) (-i) else i)
+}
+
+context(Int)
+operator fun Result.inc(): Result {
+    operationScore += this@Int
+    return Result(i + 1)
+}
+
+context(Int)
+operator fun Result.dec(): Result {
+    operationScore += this@Int
+    return Result(i - 1)
+}
+
+fun box(): String {
+    var result = Result(0)
+    with(1) {
+        result++
+        result++
+        (-result)
+        +result
+        result--
+    }
+    return if (result.i == 1 && operationScore == 5) "OK" else "fail"
+}
+
+