Improvements to the kernel tree shaker.

tests/language/language_kernel.status

 # Copyright (c) 2016, 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.
 
 # These tests currently take too long. Remove when they are fixed.
 [ $compiler == dartk || $compiler == dartkp ]
 large_class_declaration_test: SkipSlow  # KernelVM Issue 28312
 
 ###############################################################################
 # Dartk Entries
 ###############################################################################
 
 [ $compiler == dartk || $compiler == dartkp ]
 conditional_import_string_test: DartkCompileTimeError
 conditional_import_test: DartkCompileTimeError
 conflicting_type_variable_and_setter_test: DartkCompileTimeError
 const_for_in_variable_test/01: MissingCompileTimeError
 constructor_duplicate_final_test/03: MissingCompileTimeError
 covariant_override_test: DartkCrash
 deep_nesting1_negative_test: DartkCrash
 deep_nesting2_negative_test: DartkCrash
+enum_syntax_test/05: MissingCompileTimeError
 enum_syntax_test/06: MissingCompileTimeError
 external_test/21: MissingCompileTimeError
 external_test/24: MissingCompileTimeError
 external_test/25: MissingCompileTimeError
 final_syntax_test/01: MissingCompileTimeError
 final_syntax_test/02: MissingCompileTimeError
 final_syntax_test/03: MissingCompileTimeError
 final_syntax_test/04: MissingCompileTimeError
 metadata_test: DartkCompileTimeError
 multiline_newline_test/01: DartkCompileTimeError
@@ skipping 31 matching lines @@
 covariant_test/51: MissingCompileTimeError # 28166
 covariant_test/52: DartkCompileTimeError # 28166
 covariant_test/54: DartkCompileTimeError # 28166
 covariant_test/55: MissingCompileTimeError # 28166
 covariant_test/56: DartkCompileTimeError # 28166
 covariant_override_test: DartkCompileTimeError # Issue 28166
 
 # dartk: temporary failure
 mixin_illegal_syntax_test/00: DartkCrash
 
+# Passing for the wrong reason
+language/main_not_a_function_test/01: Pass # Fails if tree shaking is disabled
+
 # dartk: JIT failures
 [ $compiler == dartk && $runtime == vm ]
 config_import_corelib_test: RuntimeError
-enum_syntax_test/05: MissingCompileTimeError
 reify_typevar_static_test/00: MissingCompileTimeError
 type_variable_conflict2_test/06: MissingCompileTimeError
 type_variable_conflict2_test/08: MissingCompileTimeError
 type_variable_conflict2_test/10: MissingCompileTimeError
 
 # dartk: precompilation failures
 [ $compiler == dartkp && $runtime == dart_precompiled ]
 config_import_corelib_test: RuntimeError
 
 ###############################################################################
@@ skipping 102 matching lines @@
 getter_closure_execution_order_test: RuntimeError
 getter_setter_in_lib_test: RuntimeError
 inferrer_closure_test: RuntimeError
 initializing_formal_final_test: RuntimeError
 is_not_class2_test: RuntimeError
 issue13474_test: RuntimeError
 issue_1751477_test: RuntimeError
 library_env_test/has_html_support: RuntimeError
 library_env_test/has_no_io_support: RuntimeError
 list_literal4_test: RuntimeError
-main_not_a_function_test/01: Crash
 malformed_test/none: RuntimeError
 map_literal3_test: RuntimeError
 map_literal4_test: RuntimeError  # Checked Mode Issue
 map_literal6_test: RuntimeError
 method_override_test: RuntimeError
 mixin_type_parameters_super_extends_test: RuntimeError
 mixin_type_parameters_super_test: RuntimeError
 multiline_newline_test/none: RuntimeError
 named_parameters_type_test/01: MissingRuntimeError
 named_parameters_type_test/02: MissingRuntimeError
@@ skipping 20 matching lines @@
 type_variable_function_type_test: RuntimeError
 vm/type_cast_vm_test: RuntimeError
 vm/type_vm_test: RuntimeError
 
 # dartk: JIT failures
 [ $compiler == dartk && $runtime == vm ]
 const_locals_test: RuntimeError
 constructor_named_arguments_test/01: Crash  # Dartk Issue 28301
 const_string_test: RuntimeError  # Dartk Issue 28306
 library_env_test/has_no_mirror_support: RuntimeError
-main_not_a_function_test/01: Crash
 redirecting_factory_reflection_test: RuntimeError
 
 # dartk: JIT failures (debug)
 [ $compiler == dartk && $runtime == vm && $mode == debug ]
 not_enough_positional_arguments_test/02: Crash  # Dartk Issue 28301
 not_enough_positional_arguments_test/05: Crash  # Dartk Issue 28301
 
 # dartk: precompilation failures
 [ $compiler == dartkp && $runtime == dart_precompiled ]
 if_null_assignment_static_test/35: Crash  # Dartk Issue 28302
@@ skipping 28 matching lines @@
 named_parameters_type_test/01: Crash
 named_parameters_type_test/02: Crash
 named_parameters_type_test/03: Crash
 positional_parameters_type_test/01: Crash
 positional_parameters_type_test/02: Crash
 type_checks_in_factory_method_test: Crash
 vm/regress_27671_test: Crash
 vm/type_vm_test: Crash
 
 [ $compiler == dartk || $compiler == dartkp ]
-vm/async_await_catch_stacktrace_test: RuntimeError # Issue 28446
+vm/async_await_catch_stacktrace_test: RuntimeError # Issue 28446