Check in codegen test expectations.

test/codegen/expect/language/async_rethrow_test.js

+dart_library.library('language/async_rethrow_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__async_rethrow_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const async = dart_sdk.async;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const async_rethrow_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  async_rethrow_test.exceptionString = "exceptionalString";
+  async_rethrow_test.throwString = function() {
+    return dart.async(function*() {
+      try {
+        dart.throw(async_rethrow_test.exceptionString);
+      } catch (e) {
+        yield 1;
+        dart.throw(e);
+      }
+
+    }, dart.dynamic);
+  };
+  dart.fn(async_rethrow_test.throwString, VoidTodynamic());
+  async_rethrow_test.rethrowString = function() {
+    return dart.async(function*() {
+      try {
+        dart.throw(async_rethrow_test.exceptionString);
+      } catch (e) {
+        yield 1;
+        throw e;
+      }
+
+    }, dart.dynamic);
+  };
+  dart.fn(async_rethrow_test.rethrowString, VoidTodynamic());
+  async_rethrow_test.testThrow = function() {
+    let f = async.Future._check(async_rethrow_test.throwString());
+    f.then(dart.dynamic)(dart.fn(v => {
+      expect$.Expect.fail("Exception not thrown");
+    }, dynamicTodynamic()), {onError: dart.fn(e => {
+        expect$.Expect.equals(async_rethrow_test.exceptionString, e);
+      }, dynamicTodynamic())});
+  };
+  dart.fn(async_rethrow_test.testThrow, VoidTodynamic());
+  async_rethrow_test.testRethrow = function() {
+    let f = async.Future._check(async_rethrow_test.rethrowString());
+    f.then(dart.dynamic)(dart.fn(v => {
+      expect$.Expect.fail("Exception not thrown");
+    }, dynamicTodynamic()), {onError: dart.fn(e => {
+        expect$.Expect.equals(async_rethrow_test.exceptionString, e);
+      }, dynamicTodynamic())});
+  };
+  dart.fn(async_rethrow_test.testRethrow, VoidTodynamic());
+  async_rethrow_test.main = function() {
+    async_rethrow_test.testThrow();
+    async_rethrow_test.testRethrow();
+  };
+  dart.fn(async_rethrow_test.main, VoidTodynamic());
+  // Exports:
+  exports.async_rethrow_test = async_rethrow_test;
+});