Check in codegen test expectations.

test/codegen/expect/language/side_effect_throw_test.js

+dart_library.library('language/side_effect_throw_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__side_effect_throw_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 side_effect_throw_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  side_effect_throw_test.B = class B extends core.Object {
+    ['<<'](other) {
+      side_effect_throw_test.B.x = other;
+      return 33;
+    }
+  };
+  dart.setSignature(side_effect_throw_test.B, {
+    methods: () => ({'<<': dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  side_effect_throw_test.B.x = null;
+  const _m = Symbol('_m');
+  side_effect_throw_test.A = class A extends core.Object {
+    get [_m]() {
+      return new side_effect_throw_test.B();
+    }
+    opshl(n) {
+      return dart.dsend(dart.dsend(this[_m], '<<', 499), '|', 2 - dart.notNull(core.num._check(n)));
+    }
+  };
+  dart.setSignature(side_effect_throw_test.A, {
+    methods: () => ({opshl: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  side_effect_throw_test.main = function() {
+    let a = new side_effect_throw_test.A();
+    expect$.Expect.throws(dart.fn(() => a.opshl("string"), VoidTovoid()));
+    expect$.Expect.equals(499, side_effect_throw_test.B.x);
+  };
+  dart.fn(side_effect_throw_test.main, VoidTodynamic());
+  // Exports:
+  exports.side_effect_throw_test = side_effect_throw_test;
+});