More throw/rethrow fixes.

tests/language/type_error_test.dart

Index: tests/language/type_error_test.dart
diff --git a/tests/language/type_error_test.dart b/tests/language/type_error_test.dart
index 6f0303bb795f287e9892f97ebd055f09c9c2fc21..fc62c23b936709710aef4246c03d3eb91bf3e087 100644
--- a/tests/language/type_error_test.dart
+++ b/tests/language/type_error_test.dart
@@ -145,7 +145,7 @@ checkAssert(o) {
     assert(o);
   } on TypeError catch (e) {
     print(e); // This might provoke an error.
-    if (!assertionsEnabled) throw; // Unexpected error.
+    if (!assertionsEnabled) rethrow; // Unexpected error.
   }
 }
 
@@ -154,7 +154,7 @@ checkCastError(o) {
     print(o);
   } on TypeError catch (e) {
     print('unexpected type error: ${Error.safeToString(e)}');
-    throw; // Unexpected type error.
+    rethrow; // Unexpected type error.
   } on CastError catch (e) {
     print(e); // This might provoke an error.
     return; // Expected a cast error.