Clean up error handling.

dart/tests/compiler/dart2js/analyze_only_test.dart

 // 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.
 
 // Smoke test of the dart2js compiler API.
 library analyze_only;
 
 import "package:expect/expect.dart";
 import 'dart:async';
 
@@ skipping 35 matching lines @@
   });
 }
 
 main() {
   runCompiler(
     "",
     [],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.equals(1, errors.length);
-      Expect.equals('Could not find main', errors[0].toString());
+      Expect.equals('Error: Could not find "main".', errors[0].toString());
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     "main() {}",
     [],
     (String code, List errors, List warnings) {
       Expect.isNotNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     "",
     ['--analyze-only'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.equals(1, errors.length);
-      Expect.isTrue(errors[0].toString().startsWith('Could not find main'));
+      Expect.isTrue(
+          errors[0].toString().startsWith('Error: Could not find "main".'));
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     "main() {}",
     ['--analyze-only'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     "Foo foo; // Unresolved but not analyzed.",
     ['--analyze-only'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.equals(1, errors.length);
-      Expect.isTrue(errors[0].toString().startsWith('Could not find main'));
+      Expect.isTrue(
+          errors[0].toString().startsWith('Error: Could not find "main".'));
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     """main() {
          Foo foo; // Unresolved and analyzed.
        }""",
     ['--analyze-only'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.equals(1, warnings.length);
-      Expect.equals('Warning: cannot resolve type Foo', warnings[0].toString());
+      Expect.equals(
+          'Warning: Cannot resolve type "Foo".', warnings[0].toString());
     });
 
   runCompiler(
     """main() {
          Foo foo; // Unresolved and analyzed.
        }""",
     ['--analyze-only', '--analyze-signatures-only'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.isTrue(warnings.isEmpty);
     });
 
   runCompiler(
     "Foo foo; // Unresolved and analyzed.",
     ['--analyze-only', '--analyze-all'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
-      Expect.equals('Warning: cannot resolve type Foo', warnings[0].toString());
+      Expect.equals(
+          'Warning: Cannot resolve type "Foo".', warnings[0].toString());
     });
 
   runCompiler(
     """Foo foo; // Unresolved and analyzed.
        main() {}""",
     ['--analyze-only', '--analyze-all'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.equals(1, warnings.length);
-      Expect.equals('Warning: cannot resolve type Foo', warnings[0].toString());
+      Expect.equals(
+          'Warning: Cannot resolve type "Foo".', warnings[0].toString());
     });
 
   runCompiler(
     "",
     ['--analyze-only', '--analyze-all'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.isTrue(warnings.isEmpty);
     });
 
   // --analyze-signatures-only implies --analyze-only
   runCompiler(
     "",
     ['--analyze-signatures-only', '--analyze-all'],
     (String code, List errors, List warnings) {
       Expect.isNull(code);
       Expect.isTrue(errors.isEmpty);
       Expect.isTrue(warnings.isEmpty);
     });
 }