Flag that --dump-info is not supported for dart2dart.

pkg/compiler/lib/src/dart2js.dart

 // Copyright (c) 2013, 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.
 
 library dart2js.cmdline;
 
 import 'dart:async'
     show Future, EventSink;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io'
@@ skipping 96 matching lines @@
   Uri sourceMapOut = currentDirectory.resolve('out.js.map');
   Uri packageRoot = null;
   List<String> options = new List<String>();
   bool explicitOut = false;
   bool wantHelp = false;
   bool wantVersion = false;
   String outputLanguage = 'JavaScript';
   bool stripArgumentSet = false;
   bool analyzeOnly = false;
   bool analyzeAll = false;
+  bool dumpInfo = false;
   bool allowNativeExtensions = false;
   bool trustTypeAnnotations = false;
   bool trustPrimitives = false;
   bool checkedMode = false;
   // List of provided options that imply that output is expected.
   List<String> optionsImplyCompilation = <String>[];
   bool hasDisallowUnsafeEval = false;
   // TODO(johnniwinther): Measure time for reading files.
   SourceFileProvider inputProvider = new CompilerSourceFileProvider();
   diagnosticHandler = new FormattingDiagnosticHandler(inputProvider);
@@ skipping 72 matching lines @@
   setVerbose(_) {
     diagnosticHandler.verbose = true;
     passThrough('--verbose');
   }
 
   implyCompilation(String argument) {
     optionsImplyCompilation.add(argument);
     passThrough(argument);
   }
 
+  setDumpInfo(String argument) {
+    implyCompilation(argument);
+    dumpInfo = true;
+  }
+
   setTrustTypeAnnotations(String argument) {
     trustTypeAnnotations = true;
     implyCompilation(argument);
   }
 
   setTrustPrimitives(String argument) {
     trustPrimitives = true;
     implyCompilation(argument);
   }
 
@@ skipping 102 matching lines @@
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
     new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
     new OptionHandler('--analyze-all', setAnalyzeAll),
     new OptionHandler('--analyze-only', setAnalyzeOnly),
     new OptionHandler('--analyze-signatures-only', setAnalyzeOnly),
     new OptionHandler('--disable-native-live-type-analysis', passThrough),
     new OptionHandler('--categories=.*', setCategories),
     new OptionHandler('--disable-type-inference', implyCompilation),
     new OptionHandler('--terse', passThrough),
     new OptionHandler('--deferred-map=.+', implyCompilation),
-    new OptionHandler('--dump-info', implyCompilation),
+    new OptionHandler('--dump-info', setDumpInfo),
     new OptionHandler('--disallow-unsafe-eval',
                       (_) => hasDisallowUnsafeEval = true),
     new OptionHandler('--show-package-warnings', passThrough),
     new OptionHandler('--csp', passThrough),
     new OptionHandler('--enable-experimental-mirrors', passThrough),
     new OptionHandler('--enable-async', (_) {
       diagnosticHandler.info(
           "Option '--enable-async' is no longer needed. "
           "Async-await is supported by default.",
           api.Diagnostic.HINT);
@@ skipping 65 matching lines @@
         "but compilation is turned off by the option '--analyze-only'.",
         api.Diagnostic.INFO);
   }
   if (analyzeAll) analyzeOnly = true;
   if (!analyzeOnly) {
     if (allowNativeExtensions) {
       helpAndFail("Option '--allow-native-extensions' is only supported in "
                   "combination with the '--analyze-only' option.");
     }
   }
+  if (dumpInfo && outputLanguage == OUTPUT_LANGUAGE_DART) {
+    helpAndFail("Option '--dump-info' is not supported in "
+                "combination with the '--output-type=dart' option.");
+  }
 
   diagnosticHandler.info('Package root is $packageRoot');
 
   options.add('--out=$out');
   options.add('--source-map=$sourceMapOut');
 
   RandomAccessFileOutputProvider outputProvider =
       new RandomAccessFileOutputProvider(
           out, sourceMapOut, onInfo: diagnosticHandler.info, onFailure: fail);
 
@@ skipping 171 matching lines @@
     unsupported category, for example, --categories=help.  To enable
     all categories, use --categories=all.
 
   --deferred-map=<file>
     Generates a json file with a mapping from each deferred import to a list of
     the part.js files that will be loaded.
 
   --dump-info
     Generates an out.info.json file with information about the generated code.
     You can inspect the generated file with the viewer at:
-    https://dart-lang.github.io/dump-info-visualizer/
+        https://dart-lang.github.io/dump-info-visualizer/
+    This feature is currently not supported in combination with the 
+    '--output-type=dart' option.
 
   --generate-code-with-compile-time-errors
     Generates output even if the program contains compile-time errors. Use the
     exit code to determine if compilation failed.
 '''.trim());
 }
 
 void helpAndExit(bool wantHelp, bool wantVersion, bool verbose) {
   if (wantVersion) {
     var version = (BUILD_ID == null)
@@ skipping 98 matching lines @@
       } else if (exitCode == 253) {
         print(">>> TEST CRASH");
       } else {
         print(">>> TEST FAIL");
       }
       stderr.writeln(">>> EOF STDERR");
       subscription.resume();
     });
   });
 }