Implement generalized function types.

tests/co19/co19-dart2js.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.
 
 [ $compiler == dart2js ]
 Language/Expressions/Function_Invocation/async_cleanup_t01: Skip # https://github.com/dart-lang/sdk/issues/28873
 Language/Expressions/Function_Invocation/async_cleanup_t03: Skip # https://github.com/dart-lang/sdk/issues/28873
 Language/Expressions/Function_Invocation/async_cleanup_t05: Skip # https://github.com/dart-lang/sdk/issues/28873
 Language/Expressions/Function_Invocation/async_cleanup_t06: Skip # https://github.com/dart-lang/sdk/issues/28873
 Language/Expressions/Function_Invocation/async_cleanup_t08: Skip # https://github.com/dart-lang/sdk/issues/28873
@@ skipping 75 matching lines @@
 Language/Expressions/Assignment/super_assignment_value_t02: RuntimeError # Please triage this failure
 Language/Expressions/Await_Expressions/evaluation_throws_t03: RuntimeError # Please triage this failure
 Language/Expressions/Await_Expressions/evaluation_throws_t04: RuntimeError # Please triage this failure
 Language/Expressions/Await_Expressions/evaluation_throws_t06: RuntimeError # Please triage this failure
 Language/Expressions/Await_Expressions/evaluation_throws_t07: RuntimeError # Please triage this failure
 Language/Expressions/Constants/identifier_denotes_a_constant_t06: MissingCompileTimeError # Issue 26580
 Language/Expressions/Constants/identifier_denotes_a_constant_t07: MissingCompileTimeError # Issue 26580
 Language/Expressions/Function_Invocation/async_generator_invokation_t08: Timeout, Skip # Issue 25967
 Language/Expressions/Function_Invocation/async_generator_invokation_t10: Timeout, Skip # Issue 25967
 Language/Expressions/Function_Invocation/async_invokation_t04: RuntimeError, Pass # co19 issue 57
-Language/Expressions/Identifier_Reference/built_in_not_dynamic_t15: MissingCompileTimeError # Issue 26581
-Language/Expressions/Identifier_Reference/syntax_built_in_t01: fail # Issue 21154
 Language/Expressions/Instance_Creation/New/evaluation_t19: RuntimeError # Please triage this failure
 Language/Expressions/Instance_Creation/New/evaluation_t20: RuntimeError # Please triage this failure
 Language/Expressions/Maps/key_value_equals_operator_t02: CompileTimeError # Please triage this failure
 Language/Expressions/Maps/static_type_dynamic_t01: CompileTimeError # Maybe ok. Issue 17207
 Language/Expressions/Method_Invocation/Ordinary_Invocation/object_method_invocation_t01: MissingCompileTimeError # Issue 25496
 Language/Expressions/Method_Invocation/Ordinary_Invocation/object_method_invocation_t02: MissingCompileTimeError # Issue 25496
 Language/Expressions/Numbers/syntax_t06: fail # Issue 21098
 Language/Expressions/Numbers/syntax_t09: fail # Issue 21098
 Language/Expressions/Object_Identity/Object_Identity/constant_objects_t01: fail # Issue 11551, also related to issue 563, 18738
 Language/Expressions/Object_Identity/Object_Identity/double_t02: fail # Issue 11551, also related to issue 563, 18738
@@ skipping 8373 matching lines @@
 WebPlatformTest/webstorage/storage_builtins_t01: RuntimeError # Please triage this failure
 WebPlatformTest/webstorage/storage_local_setitem_quotaexceedederr_t01: Skip # Times out. Please triage this failure
 
 [ $compiler == dart2js && $runtime == ie11 && $builder_tag == win8]
 LibTest/typed_data/ByteData/offsetInBytes_A01_t01: RuntimeError # Please triage this failure
 LayoutTests/fast/dom/XMLSerializer-attribute-entities_t01: RuntimeError # Please triage this failure
 LayoutTests/fast/dom/serialize-attribute_t01: RuntimeError # Please triage this failure
 
 [ $compiler == dart2js && $host_checked ]
 Language/Types/Function_Types/call_t01: Crash # Issue 28894