diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractConstructor.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractConstructor.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractConstructor.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractConstructor.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractDeclarations.d.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractDeclarations.d.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractDeclarations.d.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractDeclarations.d.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractInheritance.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInheritance.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractInheritance.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInheritance.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractMethodWithImplementation.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMethodWithImplementation.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractMethodWithImplementation.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMethodWithImplementation.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractMixedWithModifiers.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMixedWithModifiers.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractMixedWithModifiers.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractMixedWithModifiers.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractOverloads.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractOverloads.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractOverloads.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractOverloads.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractProperties.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractProperties.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractProperties.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractProperties.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractSuperCalls.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractSuperCalls.ts
similarity index 100%
rename from tests/cases/conformance/classes/classDeclarations/classAbstractSuperCalls.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractSuperCalls.ts
diff --git a/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractUsingAbstractMethod.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractUsingAbstractMethod.ts
new file mode 100644
index 00000000000..8561fa2ce15
--- /dev/null
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractUsingAbstractMethod.ts
@@ -0,0 +1,17 @@
+abstract class A {
+    abstract foo() : number;
+}
+
+class B extends A {
+    foo() { return 1; }
+}
+
+abstract class C extends A  {
+    abstract foo() : number;
+}
+
+var a = new B;
+a.foo();
+
+a = new C; // error, cannot instantiate abstract class.
+a.foo();
\ No newline at end of file
diff --git a/tests/cases/conformance/classes/classDeclarations/classInstantiatingAbstractClass.ts b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classInstantiatingAbstractClass.ts
similarity index 56%
rename from tests/cases/conformance/classes/classDeclarations/classInstantiatingAbstractClass.ts
rename to tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classInstantiatingAbstractClass.ts
index beb44cc7894..d60a39a3f2c 100644
--- a/tests/cases/conformance/classes/classDeclarations/classInstantiatingAbstractClass.ts
+++ b/tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classInstantiatingAbstractClass.ts
@@ -15,4 +15,12 @@ var c : C;
 
 a = new B;
 b = new B;
-c = new B;
\ No newline at end of file
+c = new B;
+
+module M {
+    export abstract class A {}
+}
+
+import myA = M.A;
+
+var aa = new myA;