Check in codegen test expectations.

test/codegen/expect/language/setter4_test.js

+dart_library.library('language/setter4_test', null, /* Imports */[
+  'dart_sdk'
+], function load__setter4_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const setter4_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  setter4_test.A = class A extends core.Object {
+    a() {
+      return 1;
+    }
+    set a(val) {
+      let i = core.int._check(val);
+    }
+  };
+  dart.setSignature(setter4_test.A, {
+    methods: () => ({a: dart.definiteFunctionType(core.int, [])})
+  });
+  setter4_test.main = function() {
+  };
+  dart.fn(setter4_test.main, VoidTodynamic());
+  // Exports:
+  exports.setter4_test = setter4_test;
+});