Check in codegen test expectations.

test/codegen/expect/language/loop_exchange4_test.js

Index: test/codegen/expect/language/loop_exchange4_test.js
diff --git a/test/codegen/expect/language/loop_exchange4_test.js b/test/codegen/expect/language/loop_exchange4_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..8780733c0118028919375e2c2c630a1322ab4960
--- /dev/null
+++ b/test/codegen/expect/language/loop_exchange4_test.js
@@ -0,0 +1,26 @@
+dart_library.library('language/loop_exchange4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__loop_exchange4_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 loop_exchange4_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  loop_exchange4_test.main = function() {
+    let count = 0;
+    for (let i = 0; i < 1; i++, count = count + i) {
+    }
+    let foo = null;
+    for (let i = 0; i < 10; foo = i, i++) {
+      if (i > 0) {
+        expect$.Expect.equals(i - 1, foo);
+      }
+    }
+  };
+  dart.fn(loop_exchange4_test.main, VoidTodynamic());
+  // Exports:
+  exports.loop_exchange4_test = loop_exchange4_test;
+});