Test on abstract bridge

backend.native/tests/build.gradle

@@ -683,6 +683,11 @@ task bridges_test16(type: RunKonanTest) {
     source = "codegen/bridges/test16.kt"
 }
 
+task bridges_test17(type: RunKonanTest) {
+    goldValue = "42\n42\n42\n42\n"
+    source = "codegen/bridges/test17.kt"
+}
+
 task bridges_linkTest(type: LinkKonanTest) {
     goldValue = "42\n42\n42\n"
     source = "codegen/bridges/linkTest_main.kt"

backend.native/tests/codegen/bridges/test17.kt

@@ -0,0 +1,25 @@
+// abstract bridge
+interface A<T> {
+    fun foo(): T
+}
+
+abstract class B<T>: A<T>
+
+abstract class C: B<Int>()
+
+class D: C() {
+    override fun foo(): Int {
+        return 42
+    }
+}
+
+fun main(args: Array<String>) {
+    val d = D()
+    val c: C = d
+    val b: B<Int> = d
+    val a: A<Int> = d
+    println(d.foo())
+    println(c.foo())
+    println(b.foo())
+    println(a.foo())
+}