Migrate test block 7 to Dart 2.0.

tests/corelib_2/error_stack_trace_test.dart

Index: tests/corelib_2/error_stack_trace_test.dart
diff --git a/tests/corelib_strong/error_stack_trace_test.dart b/tests/corelib_2/error_stack_trace_test.dart
similarity index 74%
rename from tests/corelib_strong/error_stack_trace_test.dart
rename to tests/corelib_2/error_stack_trace_test.dart
index 6851f7b904ca3b4bef8f4cde944e65d733289029..41f003ec7901688d63de78e61a9e44dcb7d24827 100644
--- a/tests/corelib_strong/error_stack_trace_test.dart
+++ b/tests/corelib_2/error_stack_trace_test.dart
@@ -8,8 +8,9 @@ void argument() {
   throw new ArgumentError(499);
 }
 
+// Verify that
 void noSuchMethod() {
-  (499).doesNotExist();
+  (499 as dynamic).doesNotExist();
 }
 
 void nullThrown() {
@@ -20,25 +21,10 @@ void range() {
   throw new RangeError.range(0, 1, 2);
 }
 
-void fallThrough() {
-  nested() {}
-
-  switch (5) {
-    case 5:
-      nested();
-    default:
-      Expect.fail("Should not reach");
-  }
-}
-
 abstract class A {
   foo();
 }
 
-void abstractClassInstantiation() {
-  new A();
-}
-
 void unsupported() {
   throw new UnsupportedError("unsupported");
 }
@@ -48,25 +34,24 @@ void unimplemented() {
 }
 
 void state() {
-  return [1, 2].single;
+  [1, 2].single;
 }
 
-void type() {
-  return 1 + "string";
+void cast() {
+  dynamic d = 1;
+  d as String;
 }
 
 main() {
   List<Function> errorFunctions = [
     argument,
     noSuchMethod,
-    nullThrown,
+    nullThrown, //# nullThrown: ok
     range,
-    fallThrough,
-    abstractClassInstantiation,
     unsupported,
     unimplemented,
     state,
-    type
+    cast,
   ];
 
   for (var f in errorFunctions) {