Check in codegen test expectations.

test/codegen/expect/language/operator6_test.js

+dart_library.library('language/operator6_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__operator6_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 operator6_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  operator6_test.OperatorTest = class OperatorTest extends core.Object {
+    new() {
+    }
+    static testMain() {
+      let op1 = new operator6_test.Operator(1);
+      let op2 = new operator6_test.Operator(2);
+      expect$.Expect.equals(~1 >>> 0, op1['~']());
+    }
+  };
+  dart.setSignature(operator6_test.OperatorTest, {
+    constructors: () => ({new: dart.definiteFunctionType(operator6_test.OperatorTest, [])}),
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  operator6_test.OperatorTest.i1 = null;
+  operator6_test.OperatorTest.i2 = null;
+  operator6_test.Operator = class Operator extends core.Object {
+    new(i) {
+      this.value = null;
+      this.value = i;
+    }
+    ['~']() {
+      return ~dart.notNull(this.value) >>> 0;
+    }
+  };
+  dart.setSignature(operator6_test.Operator, {
+    constructors: () => ({new: dart.definiteFunctionType(operator6_test.Operator, [core.int])}),
+    methods: () => ({'~': dart.definiteFunctionType(dart.dynamic, [])})
+  });
+  operator6_test.main = function() {
+    operator6_test.OperatorTest.testMain();
+  };
+  dart.fn(operator6_test.main, VoidTodynamic());
+  // Exports:
+  exports.operator6_test = operator6_test;
+});