Unused symbol: add test to fix behaviour #KT-16318 Obsolete

idea/testData/inspectionsLocal/unusedSymbol/asDefaultConstructorParameter.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+
+class My(val x: Int = IMPORTANT_CONST) {
+    companion object {
+        val <caret>IMPORTANT_CONST = 42
+    }
+}