enable fasta scanner in analyzer by default

tests/language/number_identifier_test.dart

 // Copyright (c) 2011, 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 "package:expect/expect.dart";
 
 main() {
   // Integer literals.
   Expect.isTrue(2 is int);
   Expect.equals(2, 2 as int);
@@ skipping 11 matching lines @@
   Expect.isTrue(-2.0 is double);
   Expect.equals(-2.0, -2.0 as double);
   Expect.isTrue(.2 is double);
   Expect.equals(0.2, .2 as double);
   Expect.isTrue(1e2 is double);
   Expect.equals(1e2, 1e2 as double);
   Expect.isTrue(1e-2 is double);
   Expect.equals(1e-2, 1e-2 as double);
   Expect.isTrue(1e+2 is double);
   Expect.equals(1e+2, 1e+2 as double);
-  Expect.throws(() => 1.e+2, //                      //# 05: ok
+  Expect.throws(() => 1.e+2, //                      //# 05: static type warning
                 (e) => e is NoSuchMethodError); //   //# 05: continued
   1d; // //# 06: compile-time error
   1D; // //# 07: compile-time error
   Expect.throws(() => 1.d+2, //                      //# 08: ok
                 (e) => e is NoSuchMethodError); //   //# 08: continued
   Expect.throws(() => 1.D+2, //                      //# 09: ok
                 (e) => e is NoSuchMethodError); //   //# 09: continued
   1.1d; // //# 10: compile-time error
   1.1D; // //# 11: compile-time error
   1e; // //# 02: compile-time error
   1x; // //# 03: compile-time error
 }