Check in codegen test expectations.

test/codegen/expect/corelib/apply4_test.js

+dart_library.library('corelib/apply4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__apply4_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const apply4_test = Object.create(null);
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  apply4_test.A = class A extends core.Object {
+    foo(x, y, z, a, b, c, d, e, f, g, h, i, j) {
+      if (y === void 0) y = null;
+      if (z === void 0) z = null;
+      if (a === void 0) a = null;
+      if (b === void 0) b = null;
+      if (c === void 0) c = null;
+      if (d === void 0) d = 99;
+      if (e === void 0) e = null;
+      if (f === void 0) f = null;
+      if (g === void 0) g = null;
+      if (h === void 0) h = null;
+      if (i === void 0) i = null;
+      if (j === void 0) j = null;
+      return dart.str`${x} ${d}`;
+    }
+  };
+  dart.setSignature(apply4_test.A, {
+    methods: () => ({foo: dart.definiteFunctionType(dart.dynamic, [dart.dynamic], [dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic, dart.dynamic])})
+  });
+  apply4_test.main = function() {
+    let a = new apply4_test.A();
+    let clos = dart.bind(a, 'foo');
+    expect$.Expect.equals(core.Function.apply(clos, JSArrayOfString().of(["well"])), "well 99");
+    expect$.Expect.equals(core.Function.apply(clos, JSArrayOfObject().of(["well", 0, 2, 4, 3, 6, 9, 10])), "well 9");
+  };
+  dart.fn(apply4_test.main, VoidTodynamic());
+  // Exports:
+  exports.apply4_test = apply4_test;
+});