Support is tests

tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart

Index: tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
diff --git a/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart b/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
index fd3572443d2b4e3c3aa78828a2afc993b4265203..7bd194d1649c3133115446cdb8ed186057fc5a6b 100644
--- a/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
+++ b/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
@@ -50,6 +50,7 @@ const List<Test> TESTS = const <Test>[
   const Test(const {
     'main.dart': '''
 import 'dart:html';
+import 'package:expect/expect.dart';
 
 foo({named}) => 1;
 bar(a) => !a;
@@ -71,6 +72,8 @@ class SubClass extends Class {
   }  
 }
 
+class Generic<T> {}

[sra1, 2017/07/11 21:46:25]

This could be a separate test.

[Johnni Winther, 2017/07/12 07:51:30]

Actually, I needed a generic class to trigger the failing part of the is-test
(where we had MemberElement and ResolutionDartType). Using List trigger even
more errors so I added this to ensure that there is no special-casing on the
class.

+
 var toplevel;
 
 main() {
@@ -123,9 +126,19 @@ main() {
     break;
   }
   x = toplevel;
+  x = testIs(x);
+  x = testAsGeneric(x);
+  x = testAsFunction(x);
   print(x);
   return x;
 }
+typedef NoArg();
+@NoInline()
+testIs(o) => o is Generic<int> || o is NoArg;
+@NoInline()
+testAsGeneric(o) => o as Generic<int>;
+@NoInline()
+testAsFunction(o) => o as NoArg;
 '''
   }),
   const Test(const {