Check in codegen test expectations.

test/codegen/expect/language/multi_assign_test.js

+dart_library.library('language/multi_assign_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__multi_assign_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 multi_assign_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  multi_assign_test.MultiAssignTest = class MultiAssignTest extends core.Object {
+    static testMain() {
+      let i = null, j = null, k = null;
+      i = j = k = 11;
+      expect$.Expect.equals(11, i);
+      expect$.Expect.equals(11, j);
+      expect$.Expect.equals(11, k);
+      let m = null;
+      let n = m = k = 55;
+      expect$.Expect.equals(55, m);
+      expect$.Expect.equals(55, n);
+      expect$.Expect.equals(55, k);
+    }
+  };
+  dart.setSignature(multi_assign_test.MultiAssignTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  multi_assign_test.main = function() {
+    multi_assign_test.MultiAssignTest.testMain();
+  };
+  dart.fn(multi_assign_test.main, VoidTodynamic());
+  // Exports:
+  exports.multi_assign_test = multi_assign_test;
+});