PSI2IR KT-49526 function reference type approximation hack

compiler/testData/codegen/box/callableReference/kt49526_sam.kt

@@ -0,0 +1,35 @@
+// IGNORE_BACKEND: JVM
+// IGNORE_LIGHT_ANALYSIS
+
+// IGNORE_BACKEND_FIR: JVM_IR
+// FIR_STATUS: LambdaConversionException: Type mismatch for lambda argument 1: class java.lang.Object is not convertible to interface I1
+// JVM_IR it this case has an approximated type 'KFun<out Any>', which has a projected top-level argument.
+
+fun <T> intersect(x: T, y: T): T = x
+
+interface I1
+interface I2
+
+class C1 : I1, I2 {
+    override fun toString(): String = "OK"
+}
+
+class C2 : I1, I2
+
+fun <T> T.k() = K<T>(this)
+
+fun interface KFun<T> {
+    fun invoke(x: T)
+}
+
+class K<T>(private val x: T) {
+    fun with(kf: KFun<T>) {
+        kf.invoke(x)
+    }
+}
+
+fun box(): String {
+    var result = "Failed"
+    intersect(C1(), C2()).k().with { result = it.toString() }
+    return result
+}