Rip-off the backend type inferrer.

tests/language/inferrer_constructor3_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Regression test for dart2js that used to optimistically infer the
+// wrong types for fields because of generative constructors being
+// inlined.
+
+import "package:expect/expect.dart";
+import "compiler_annotations.dart";
+
+class A {
+  var field;
+  A(this.field);
+}
+
+var c = () => new List(42)[0];
+
+main() {
+  bar();
+  // Defeat type inferencing.
+  new A(c());
+  doIt();
+  bar();
+}
+
+@DontInline
+doIt() {
+  () => 42;
+  var c = new A(null);
+  Expect.throws(() => c.field + 42, (e) => e is NoSuchMethodError);
+}
+
+@DontInline
+bar() {
+  () => 42;
+  return inlineLevel1();
+}
+
+inlineLevel1() {
+  return inlineLevel2();
+}
+
+inlineLevel2() {
+  return inlineLevel3();
+}
+
+inlineLevel3() {
+  return inlineLevel4();
+}
+
+inlineLevel4() {
+  return new A(42);
+}