FIR: reproduce KT-43569

compiler/testData/ir/irText/firProblems/inapplicableCollectionSet.kt

@@ -0,0 +1,20 @@
+// WITH_RUNTIME
+// FULL_JDK
+
+class Flaf(val javaName: String) {
+
+    private val INSTANCES = mutableMapOf<String, Flaf>()
+
+    fun forJavaName(javaName: String): Flaf {
+        var result: Flaf? = INSTANCES[javaName]
+        if (result == null) {
+            result = INSTANCES["${javaName}_alternative"]
+            if (result == null) {
+                result = Flaf(javaName)
+            }
+            INSTANCES[javaName] = result
+        }
+        return result
+    }
+
+}