Check in codegen test expectations.

test/codegen/expect/language/library_private_in_constructor_test.js

+dart_library.library('language/library_private_in_constructor_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__library_private_in_constructor_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 library_private_in_constructor_test = Object.create(null);
+  const library_private_in_constructor_a = Object.create(null);
+  const library_private_in_constructor_b = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  library_private_in_constructor_test.main = function() {
+    let b = new library_private_in_constructor_b.B();
+    expect$.Expect.equals(499, b.x);
+    expect$.Expect.equals(42, b.y);
+  };
+  dart.fn(library_private_in_constructor_test.main, VoidTodynamic());
+  const _val = Symbol('_val');
+  library_private_in_constructor_a.PrivateA = class PrivateA extends core.Object {
+    new() {
+      this[_val] = 499;
+    }
+  };
+  dart.setSignature(library_private_in_constructor_a.PrivateA, {
+    constructors: () => ({new: dart.definiteFunctionType(library_private_in_constructor_a.PrivateA, [])})
+  });
+  library_private_in_constructor_a.fooA = dart.const(new library_private_in_constructor_a.PrivateA());
+  library_private_in_constructor_a.A = class A extends core.Object {
+    new() {
+      this.x = library_private_in_constructor_a.fooA[_val];
+    }
+  };
+  dart.setSignature(library_private_in_constructor_a.A, {
+    constructors: () => ({new: dart.definiteFunctionType(library_private_in_constructor_a.A, [])})
+  });
+  const _val$ = Symbol('_val');
+  library_private_in_constructor_b.PrivateB = class PrivateB extends core.Object {
+    new() {
+      this[_val$] = 42;
+    }
+  };
+  dart.setSignature(library_private_in_constructor_b.PrivateB, {
+    constructors: () => ({new: dart.definiteFunctionType(library_private_in_constructor_b.PrivateB, [])})
+  });
+  library_private_in_constructor_b.fooB = dart.const(new library_private_in_constructor_b.PrivateB());
+  library_private_in_constructor_b.B = class B extends library_private_in_constructor_a.A {
+    new() {
+      this.y = library_private_in_constructor_b.fooB[_val$];
+      super.new();
+    }
+  };
+  dart.setSignature(library_private_in_constructor_b.B, {
+    constructors: () => ({new: dart.definiteFunctionType(library_private_in_constructor_b.B, [])})
+  });
+  // Exports:
+  exports.library_private_in_constructor_test = library_private_in_constructor_test;
+  exports.library_private_in_constructor_a = library_private_in_constructor_a;
+  exports.library_private_in_constructor_b = library_private_in_constructor_b;
+});