Check in codegen test expectations.

test/codegen/expect/language/duplicate_export_test.js

+dart_library.library('language/duplicate_export_test', null, /* Imports */[
+  'dart_sdk'
+], function load__duplicate_export_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const duplicate_export_test = Object.create(null);
+  const duplicate_import_liba = Object.create(null);
+  const duplicate_export_liba = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  duplicate_export_test.main = function() {
+  };
+  dart.fn(duplicate_export_test.main, VoidTovoid());
+  duplicate_import_liba.methodOrClass = function() {
+  };
+  dart.fn(duplicate_import_liba.methodOrClass, VoidTovoid());
+  duplicate_export_test.methodOrClass = duplicate_import_liba.methodOrClass;
+  duplicate_import_liba.field = null;
+  duplicate_export_test.field = duplicate_import_liba.field;
+  duplicate_import_liba.method = function() {
+  };
+  dart.fn(duplicate_import_liba.method, VoidTovoid());
+  duplicate_export_test.method = duplicate_import_liba.method;
+  duplicate_import_liba.Class = class Class extends core.Object {};
+  duplicate_export_test.Class = duplicate_import_liba.Class;
+  duplicate_export_test.field = duplicate_import_liba.field;
+  duplicate_export_test.methodOrClass = duplicate_import_liba.methodOrClass;
+  duplicate_export_test.field = duplicate_import_liba.field;
+  duplicate_export_test.Class = duplicate_import_liba.Class;
+  duplicate_export_test.method = duplicate_import_liba.method;
+  duplicate_export_test.field = duplicate_import_liba.field;
+  duplicate_export_liba.methodOrClass = duplicate_import_liba.methodOrClass;
+  duplicate_export_liba.field = duplicate_import_liba.field;
+  duplicate_export_liba.method = duplicate_import_liba.method;
+  duplicate_export_liba.Class = duplicate_import_liba.Class;
+  duplicate_export_liba.field = duplicate_import_liba.field;
+  // Exports:
+  exports.duplicate_export_test = duplicate_export_test;
+  exports.duplicate_import_liba = duplicate_import_liba;
+  exports.duplicate_export_liba = duplicate_export_liba;
+});