fix for 1345

compiler/backend/src/org/jetbrains/jet/codegen/FunctionCodegen.java

@@ -431,6 +431,14 @@ public class FunctionCodegen {
     private static void checkOverride(CodegenContext owner, GenerationState state, ClassBuilder v, Method jvmSignature, FunctionDescriptor functionDescriptor, FunctionDescriptor overriddenFunction) {
         Method method = state.getTypeMapper().mapSignature(functionDescriptor.getName(), functionDescriptor).getAsmMethod();
         Method overriden = state.getTypeMapper().mapSignature(overriddenFunction.getName(), overriddenFunction.getOriginal()).getAsmMethod();
+
+        if(overriddenFunction.getModality() == Modality.ABSTRACT) {
+            Set<? extends FunctionDescriptor> overriddenFunctions = overriddenFunction.getOverriddenDescriptors();
+            for (FunctionDescriptor of : overriddenFunctions) {
+                checkOverride(owner, state, v, jvmSignature, overriddenFunction, of.getOriginal());
+            }
+        }
+
         if(differentMethods(method, overriden)) {
             int flags = ACC_PUBLIC | ACC_BRIDGE; // TODO.
 

compiler/testData/codegen/regressions/kt1345.kt

@@ -0,0 +1,13 @@
+trait Creator<T> {
+    fun create() : T
+}
+
+class Actor(val code: String = "OK")
+
+trait Factory : Creator<Actor>
+
+class MyFactory() : Factory {
+    override fun create(): Actor = Actor()
+}
+
+fun box() : String = MyFactory().create().code

compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java

@@ -303,4 +303,8 @@ public class ClassGenTest extends CodegenTestCase {
         blackBoxFile("regressions/kt633.kt");
     }
 
+
+    public void testKt1345() throws Exception {
+        blackBoxFile("regressions/kt1345.kt");
+    }
 }