Migrate block 162 to Dart 2.0.

tests/language_2/type_variable_bounds_test.dart

 // Copyright (c) 2012, 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.
 
 // Test of parameterized factory methods.
 
 class Foo<T extends num> {
   Foo();
 
-  factory Foo.bad() = XFoo; // //# 00: static type warning
+  factory Foo.bad() = XFoo; //# 00: compile-time error
 
-  factory Foo.good() = Foo;
+  factory Foo.good() = Foo<T>;
 
   factory Foo.IFoo() {
     return null;
   }
 }
 
 abstract class IFoo<T extends num> {
-  factory IFoo() = Foo<T>;
+  factory IFoo() = Foo<T>; //# 11: compile-time error
 }
 
 // String is not assignable to num.
 class Baz
-    extends Foo<String> //# 01: static type warning, dynamic type error
+    extends Foo<String> //# 01: compile-time error
 {}
 
 class Biz extends Foo<int> {}
 
 Foo<int> fi;
 
 // String is not assignable to num.

[eernst, 2017/09/04 17:05:02]

The actual type argument in the type annotation `Foo<String>` should be a
subtype of `num`, not just assignable, so we ought to adjust this comment.

 Foo
-    <String> //# 02: static type warning, dynamic type error
+    <String> //# 02: compile-time error
     fs;
 
 class Box<T> {
   // Box.T is not assignable to num.

[eernst, 2017/09/04 17:05:02]

Same issue: adjust to `Box.T is not guaranteed to be a subtype of num`.

-  Foo<T> t; //# 03: static type warning
+  Foo<T> t; //# 03: compile-time error
 
   makeFoo() {
     // Box.T is not assignable to num.

[eernst, 2017/09/04 17:05:02]

Same again.

-    return new Foo<T>(); //# 04: static type warning, dynamic type error
+    return new Foo<T>(); //# 04: compile-time error
   }
 }
 
 main() {
   // String is not assignable to num.

[eernst, 2017/09/04 17:05:02]

Same again: `String is not a subtype of num`.

-  var v1 = new Foo<String>(); //# 05: static type warning, dynamic type error
+  var v1 = new Foo<String>(); //# 05: compile-time error
 
   // String is not assignable to num.

[eernst, 2017/09/04 17:05:02]

Same again.

-  Foo<String> v2 = null; //# 06: static type warning
+  Foo<String> v2 = null; //# 06: compile-time error
 
   new Baz();
   new Biz();
 
   fi = new Foo();
   fs = new Foo();
 
   new Box().makeFoo();
   new Box<int>().makeFoo();
   new Box<String>().makeFoo();
 
   // Fisk does not exist.
-  new Box<Fisk>(); //# 07: static type warning
+  new Box<Fisk>(); //# 07: compile-time error
 
   // Too many type arguments.
-  new Box<Object, Object>(); //# 08: static type warning
+  new Box<Object, Object>(); //# 08: compile-time error
 
   // Fisk does not exist.
-  Box<Fisk> box = null; //# 09: static type warning
+  Box<Fisk> box = null; //# 09: compile-time error
 
   // Too many type arguments.
-  Box<Object, Object> box = null; //# 10: static type warning
+  Box<Object, Object> box = null; //# 10: compile-time error
 }