Fix crash in dartc when given cyclic type variable bounds.

compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java

Index: compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java
index 4dc6348002c9da4cd93cbe6b1325edcde530e735..903e62d97402de3fb99be3079b76e24757f34d0c 100644
--- a/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java
+++ b/compiler/javatests/com/google/dart/compiler/type/TypeAnalyzerTest.java
@@ -309,6 +309,29 @@ public class TypeAnalyzerTest extends TypeAnalyzerTestCase {
     analyzeClass(classes.get("OptionalParameter"), 1);
   }
 
+  public void testCyclicTypeVariable() {
+    Map<String, ClassElement> classes = loadSource(
+        "interface A<T> { }",
+        "typedef funcType<T>(T arg);",
+        "class B<T extends T> {}",
+        "class C<T extends A<T>> {}",
+        "class D<T extends funcType<T>> {}");
+    analyzeClasses(classes,
+        TypeErrorCode.CYCLIC_REFERENCE_TO_TYPE_VARIABLE,
+        TypeErrorCode.CYCLIC_REFERENCE_TO_TYPE_VARIABLE,
+        TypeErrorCode.CYCLIC_REFERENCE_TO_TYPE_VARIABLE);
+    ClassElement B = classes.get("B");
+    analyzeClass(B, 1);
+    assertEquals(1, B.getType().getArguments().size());
+    ClassElement C = classes.get("C");
+    analyzeClass(C, 1);
+    assertEquals(1, C.getType().getArguments().size());
+    ClassElement D = classes.get("D");
+    analyzeClass(D, 1);
+    assertEquals(1, D.getType().getArguments().size());
+
+  }
+
   public void testDoWhileStatement() {
     analyze("do {} while (true);");
     analyze("do {} while (null);");