Toward a green tools/build.py -cprecompiler -rdart_precompiled:

tests/lib/lib.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.
 
 [ $unchecked ]
 mirrors/redirecting_factory_different_type_test: SkipByDesign # Tests type checks.
 
 [ $compiler == dart2js ]
 async/schedule_microtask6_test: RuntimeError # global error handling is not supported. Issue 5958
 
@@ skipping 215 matching lines @@
 
 [ $runtime == opera && $system == windows]
 # TODO(efortuna): Investigate.
 async/timer_test: Fail, Pass
 
 [ ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_product) ]
 async/timer_not_available_test: Fail, OK
 mirrors/native_class_test: Fail, OK # This test is meant to run in a browser.
 mirrors/deferred_type_test: CompileTimeError, OK # Don't have a multitest marker for dynamic compile time errors.
 
-[ ($compiler == none || $compiler == precompiler || $compiler == dart2app) ]
+[ $compiler == none || $compiler == precompiler || $compiler == dart2app ]
 async/timer_not_available_test: SkipByDesign # only meant to test when there is no way to implement timer (currently only in d8)
 
 mirrors/symbol_validation_test: RuntimeError # Issue 13596
 
 mirrors/mirrors_used*: SkipByDesign # Invalid tests. MirrorsUsed does not have a specification, and dart:mirrors is not required to hide declarations that are not covered by any MirrorsUsed annotation.
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) ]
 async/schedule_microtask6_test: Fail # Issue 10910
 async/timer_test: Fail, Pass # Issue 15487
 async/multiple_timer_test: Fail, Pass # Issue 15487
@@ skipping 94 matching lines @@
 mirrors/mirrors_used_typedef_declaration_test/01: Crash # Assertion failure: typedef(Foo) has not been checked for cycles.
 mirrors/mirrors_used_typedef_declaration_test/none: Crash # Assertion failure: typedef(Foo) has not been checked for cycles.
 mirrors/typedef_library_test: Crash # Assertion failure: typedef(G) has not been checked for cycles.
 
 [ $compiler != dart2js ]
 async/dart2js_uncaught_error_test: Skip  # JS-integration only test
 
 [ $noopt && $arch == simarm64 ]
 async/slow_consumer2_test: Pass, RuntimeError # Issue 25726
 
-[ ($noopt || $compiler == precompiler) ]
+[ $noopt || $compiler == precompiler ]
 mirrors/*: SkipByDesign
 convert/chunked_conversion_utf88_test: Pass, Timeout
 convert/utf85_test: Pass, Timeout
 
 [ $runtime == vm && $mode == product ]
 mirrors/mirrors_reader_test: Fail,OK  # Expects exact type name.