Fix navigation to data class copy function

compiler/frontend/src/org/jetbrains/jet/lang/resolve/DescriptorResolver.java

@@ -421,7 +421,7 @@ public class DescriptorResolver {
                 Annotations.EMPTY,
                 COPY_METHOD_NAME,
                 CallableMemberDescriptor.Kind.SYNTHESIZED,
-                SourceElement.NO_SOURCE
+                classDescriptor.getSource()
         );
 
         List<ValueParameterDescriptor> parameterDescriptors = Lists.newArrayList();

idea/testData/resolve/references/DataClassCopy.kt

@@ -0,0 +1,7 @@
+package test
+
+data class D(val x: Int)
+
+val aaa = D(42).co<caret>py()
+
+// REF: (test).D

idea/tests/org/jetbrains/jet/resolve/ReferenceResolveTestGenerated.java

@@ -93,6 +93,12 @@ public class ReferenceResolveTestGenerated extends AbstractReferenceResolveTest
         doTest(fileName);
     }
     
+    @TestMetadata("DataClassCopy.kt")
+    public void testDataClassCopy() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/resolve/references/DataClassCopy.kt");
+        doTest(fileName);
+    }
+    
     @TestMetadata("DontImportRootScope.kt")
     public void testDontImportRootScope() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/testData/resolve/references/DontImportRootScope.kt");