Fix for 15979- class aliases now have missing concrete members warnings generated on them.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
index c24d202ed85e401f3957d54e2159ccff6a05c291..8f18b0a908fdea2582261453b9d5c8350335afda 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/resolver/NonErrorResolverTest.java
@@ -2430,6 +2430,49 @@ public class NonErrorResolverTest extends ResolverTestCase {
     verify(source);
   }
 
+  public void test_nonAbstractClassInheritsAbstractMemberOne_classTypeAlias_interface()
+      throws Exception {
+    // 15979
+    Source source = addSource(createSource(//
+        "abstract class M {}",
+        "abstract class A {}",
+        "abstract class I {",
+        "  m();",
+        "}",
+        "abstract class B = A with M implements I;"));
+    resolve(source);
+    assertNoErrors(source);
+    verify(source);
+  }
+
+  public void test_nonAbstractClassInheritsAbstractMemberOne_classTypeAlias_mixin()
+      throws Exception {
+    // 15979
+    Source source = addSource(createSource(//
+        "abstract class M {",
+        "  m();",
+        "}",
+        "abstract class A {}",
+        "abstract class B = A with M;"));
+    resolve(source);
+    assertNoErrors(source);
+    verify(source);
+  }
+
+  public void test_nonAbstractClassInheritsAbstractMemberOne_classTypeAlias_superclass()
+      throws Exception {
+    // 15979
+    Source source = addSource(createSource(//
+        "class M {}",
+        "abstract class A {",
+        "  m();",
+        "}",
+        "abstract class B = A with M;"));
+    resolve(source);
+    assertNoErrors(source);
+    verify(source);
+  }
+
   public void test_nonAbstractClassInheritsAbstractMemberOne_mixin_getter() throws Exception {
     // 17034
     Source source = addSource(createSource(//