Add --no-declaration-casts option to analyzer.

pkg/analyzer_cli/lib/src/options.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:io';
 
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/command_line/arguments.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/util/sdk.dart';
@@ skipping 21 matching lines @@
 typedef void ExitHandler(int code);
 
 /// Analyzer commandline configuration options.
 class CommandLineOptions {
   final bool enableNewAnalysisDriver = true;
 
   /// Return `true` if the parser is to parse asserts in the initializer list of
   /// a constructor.
   final bool enableAssertInitializer;
 
+  /// Whether declaration casts are enabled (in strong mode)
+  final bool declarationCasts;
+
   /// The path to output analysis results when in build mode.
   final String buildAnalysisOutput;
 
   /// Whether to use build mode.
   final bool buildMode;
 
   /// Whether to use build mode as a Bazel persistent worker.
   final bool buildModePersistentWorker;
 
   /// List of summary file paths to use in build mode.
@@ skipping 111 matching lines @@
         buildSummaryUnlinkedInputs =
             args['build-summary-unlinked-input'] as List<String>,
         buildSummaryOnly = args['build-summary-only'],
         buildSummaryOnlyUnlinked = args['build-summary-only-unlinked'],
         buildSummaryOutput = args['build-summary-output'],
         buildSummaryOutputSemantic = args['build-summary-output-semantic'],
         buildSuppressExitCode = args['build-suppress-exit-code'],
         contextBuilderOptions = createContextBuilderOptions(args),
         dartSdkPath = args['dart-sdk'],
         dartSdkSummaryPath = args['dart-sdk-summary'],
+        declarationCasts = args.wasParsed(declarationCastsFlag)
+            ? args[declarationCastsFlag]
+            : args[implicitCastsFlag],
         disableCacheFlushing = args['disable-cache-flushing'],
         disableHints = args['no-hints'],
         displayVersion = args['version'],
         enableTypeChecks = args['enable_type_checks'],
         enableAssertInitializer = args['enable-assert-initializers'],
         ignoreUnrecognizedFlags = args['ignore-unrecognized-flags'],
         lints = args[lintsFlag],
         log = args['log'],
         machineFormat = args['format'] == 'machine',
         perfReport = args['x-perf-report'],
         batchMode = args['batch'],
         showPackageWarnings = args['show-package-warnings'] ||
             args['package-warnings'] ||
             args['x-package-warnings-prefix'] != null,
         showPackageWarningsPrefix = args['x-package-warnings-prefix'],
         showSdkWarnings = args['sdk-warnings'],
         _sourceFiles = args.rest,
         infosAreFatal = args['fatal-infos'] || args['fatal-hints'],
         warningsAreFatal = args['fatal-warnings'],
         lintsAreFatal = args['fatal-lints'],
         strongMode = args['strong'],
-        implicitCasts = !args['no-implicit-casts'],
+        implicitCasts = args[implicitCastsFlag],
         implicitDynamic = !args['no-implicit-dynamic'],
         useAnalysisDriverMemoryByteStore =
             args['use-analysis-driver-memory-byte-store'],
         verbose = args['verbose'],
         color = args['color'];
 
   /// The path to an analysis options file
   String get analysisOptionsFile =>
       contextBuilderOptions.defaultAnalysisOptionsFilePath;
 
@@ skipping 397 matching lines @@
     if (analytics != null && !analytics.firstRun) {
       printAnalyticsInfo();
     }
 
     errorSink.writeln('');
     errorSink.writeln('''
 Run "dartanalyzer -h -v" for verbose help output, including less commonly used options.
 For more information, see https://www.dartlang.org/tools/analyzer.\n''');
   }
 }