Introduces the new syntax for deferred loading

tests/language/language.status

 # 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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 [ $compiler == none ]
 mixin_super_constructor_named_test: Fail # Issue 12631
 mixin_super_constructor_positionals_test: Fail # Issue 12631
 built_in_identifier_prefix_test: Fail # Issue 6970
 
 # These bugs refer currently ongoing language discussions.
 constructor_initializer_test/none: Fail # Issue 12633
 constructor5_test: Fail # Issue 6422
 constructor6_test: Fail # Issue 6422
 closure_in_initializer_test: Fail # Issue 6422
 
 # Regular bugs which should be fixed.
 duplicate_export_negative_test: Fail # Issue 6134
 mixin_forwarding_constructor2_test: Fail # Issue 13641
 
-deferred_constraints_constants_test/reference1: Fail
-deferred_constraints_constants_test/reference2: Fail
-deferred_constraints_constants_test/metadata1: Fail
-deferred_constraints_constants_test/metadata2: Fail
-deferred_constraints_constants_test/metadata3: Fail
-deferred_constraints_constants_test/default_argument1: Fail
-deferred_constraints_constants_test/default_argument2: Fail
-deferred_constraints_constants_test/constructor1: Fail
-deferred_constraints_constants_test/constructor2: Fail
+# Issue 17521
+deferred_constraints_constants_test/*: Fail, Pass
+deferred_constraints_type_annotation_test/*: Fail, Pass
+deferred_shadow_load_library_test: Fail
+deferred_closurize_load_library_test: Fail
+
+# These test use the old syntax, and will be phased out.
+deferred_constraints_constants_old_syntax_test/reference1: Fail, Ok
+deferred_constraints_constants_old_syntax_test/reference2: Fail, Ok
+deferred_constraints_constants_old_syntax_test/metadata1: Fail, Ok
+deferred_constraints_constants_old_syntax_test/metadata2: Fail, Ok
+deferred_constraints_constants_old_syntax_test/metadata3: Fail, Ok
+deferred_constraints_constants_old_syntax_test/default_argument1: Fail, Ok
+deferred_constraints_constants_old_syntax_test/default_argument2: Fail, Ok
+deferred_constraints_constants_old_syntax_test/constructor1: Fail, Ok
+deferred_constraints_constants_old_syntax_test/constructor2: Fail, Ok
 
 [ ($compiler == none || $compiler == dart2dart)]
-# The vm does not support deferred loading.
-deferred_constraints_type_annotation_test/as_operation: Fail
-deferred_constraints_type_annotation_test/is_check: Fail
-deferred_constraints_type_annotation_test/catch_check: Fail
-deferred_constraints_type_annotation_test/new_before_load: Fail
+# Issue 17521, 17523
+deferred_constraints_type_annotation_old_syntax_test/as_operation: Fail
+deferred_constraints_type_annotation_old_syntax_test/is_check: Fail
+deferred_constraints_type_annotation_old_syntax_test/catch_check: Fail
+deferred_constraints_type_annotation_old_syntax_test/new_before_load: Fail
+
+[ ($compiler == dart2dart)]
+# Issue 17523
+deferred_constraints_type_annotation_test/*: Fail, Pass
+deferred_constraints_constants_test/*: Fail, Pass
+deferred_constraints_type_annotation_old_syntax_test/as_operation: Fail
+deferred_constraints_type_annotation_old_syntax_test/is_check: Fail
+deferred_constraints_type_annotation_old_syntax_test/catch_check: Fail
+deferred_constraints_type_annotation_old_syntax_test/new_before_load: Fail
+deferred_shadow_load_library_test: Fail
+deferred_closurize_load_library_test: Fail
 
 [ ($compiler == none || $compiler == dart2dart) && $checked ]
-# The vm and dart2dart do not support deferred loading.
-deferred_constraints_type_annotation_test/type_annotation1: Fail
-deferred_constraints_type_annotation_test/type_annotation_generic1: Fail
-deferred_constraints_type_annotation_test/type_annotation_generic4: Fail
+# Issue 17521, 17523
+# Dart2dart does not support deferred loading.
+deferred_constraints_type_annotation_old_syntax_test/type_annotation1: Fail
+deferred_constraints_type_annotation_old_syntax_test/type_annotation_generic1: Fail
+deferred_constraints_type_annotation_old_syntax_test/type_annotation_generic4: Fail
 
 [ $compiler == none || $compiler == dartanalyzer || $compiler == dart2analyzer ]
-# The vm and analyzer do not support deferred loading.
-deferred_no_prefix_test/01: Fail
-deferred_duplicate_prefix1_test/01: Fail
-deferred_duplicate_prefix2_test/01: Fail
-deferred_duplicate_prefix3_test/01: Fail
+# Issue 17521, 17522
+deferred_no_prefix_old_syntax_test/01: Fail
+deferred_duplicate_prefix1_old_syntax_test/01: Fail
+deferred_duplicate_prefix2_old_syntax_test/01: Fail
+deferred_duplicate_prefix3_old_syntax_test/01: Fail
 
 [ $compiler == none && $runtime == vm ]
 class_keyword_test/02: MissingCompileTimeError # Issue 13627
 override_inheritance_mixed_test/08: MissingCompileTimeError # Issue 16137
 override_inheritance_mixed_test/09: MissingCompileTimeError # Issue 16137
 
 unicode_bom_test: Fail # Issue 16067
 
 [ $compiler == none && $checked ]
 type_variable_bounds4_test/01: Fail # Issue 14006
@@ skipping 52 matching lines @@
 issue13474_test: Pass, Fail # Issue 14651.
 
 [ $compiler == none && ( $runtime == dartium || $runtime == drt ) ]
 typed_message_test: Crash, Fail # Issue 13921, 14400
 vm/optimized_guarded_field_isolates_test: Fail # Issue 13921.
 override_inheritance_mixed_test/08: Fail # Issue 16137
 override_inheritance_mixed_test/09: Fail # Issue 16137
 
 [ $compiler == none && $runtime == vm && $arch == mips && $checked ]
 generic_instanceof3_test: Pass, Crash # dartbug.com/17440