Check in codegen test expectations.

test/codegen/expect/language/operator4_test.js

+dart_library.library('language/operator4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__operator4_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const operator4_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  operator4_test.A = class A extends core.Object {
+    ['<'](other) {
+      return 1;
+    }
+  };
+  dart.setSignature(operator4_test.A, {
+    methods: () => ({'<': dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  operator4_test.foo = function(a) {
+    try {
+      if (dart.test(dart.dsend(a, '<', a))) {
+        return "bad";
+      } else {
+        return 499;
+      }
+    } catch (e) {
+      if (core.TypeError.is(e)) {
+        return 499;
+      } else
+        throw e;
+    }
+
+  };
+  dart.fn(operator4_test.foo, dynamicTodynamic());
+  operator4_test.main = function() {
+    expect$.Expect.equals(499, operator4_test.foo(new operator4_test.A()));
+  };
+  dart.fn(operator4_test.main, VoidTodynamic());
+  // Exports:
+  exports.operator4_test = operator4_test;
+});