Use Fasta scanner when running analyzer.

pkg/testing/lib/src/analyze.dart

Index: pkg/testing/lib/src/analyze.dart
diff --git a/pkg/testing/lib/src/analyze.dart b/pkg/testing/lib/src/analyze.dart
index 7f053e2c6feca8d8387f8f9e4b2b6799292d061d..af328f7aeaccc3ea6417b30b1be8346c192c64bc 100644
--- a/pkg/testing/lib/src/analyze.dart
+++ b/pkg/testing/lib/src/analyze.dart
@@ -11,7 +11,7 @@ import 'dart:convert' show LineSplitter, UTF8;
 import 'dart:io'
     show Directory, File, FileSystemEntity, Platform, Process, ProcessResult;
 
-import '../testing.dart' show startDart;
+import '../testing.dart' show dartArguments, startDart;
 
 import 'log.dart' show isVerbose, splitLines;
 
@@ -221,7 +221,12 @@ Future<Null> analyzeUris(
     print("Running dartanalyzer.");
   }
   Stopwatch sw = new Stopwatch()..start();
-  Process process = await startDart(analyzer, const <String>["--batch"]);
+  Process process = await startDart(
+      analyzer,
+      const <String>["--batch"],
+      dartArguments

[danrubel, 2017/06/06 12:17:53]

copy before modifying?

[ahe, 2017/06/06 12:37:46]

Good point, but that's already taken care of, this is the documentation of
dartArguments:

/// Common arguments when running a dart program. Returns a copy that can
/// safely be modified by caller.

+        ..remove("-c")
+        ..add("-DuseFastaScanner=true"));
   process.stdin.writeln(arguments.join(" "));
   process.stdin.close();