Check in codegen test expectations.

test/codegen/expect/language/switch8_test.js

+dart_library.library('language/switch8_test', null, /* Imports */[
+  'dart_sdk'
+], function load__switch8_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const switch8_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  switch8_test.A = class A extends core.Object {
+    new() {
+    }
+  };
+  dart.setSignature(switch8_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(switch8_test.A, [])})
+  });
+  let const$;
+  switch8_test.main = function() {
+    switch (core.List.new(1)[dartx.get](0)) {
+      case const$ || (const$ = dart.const(new switch8_test.A())):
+      {
+        dart.throw('Test failed');
+      }
+    }
+  };
+  dart.fn(switch8_test.main, VoidTodynamic());
+  // Exports:
+  exports.switch8_test = switch8_test;
+});