Find diagnostic locations for use in new compiler API.

dart/frog/tests/leg/src/mock_compiler.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.
 
 #library('mock_compiler');
 
 #import("../../../../lib/uri/uri.dart");
 
 #import("../../../leg/elements/elements.dart");
 #import("../../../leg/io/io.dart", prefix: 'io');
@@ skipping 57 matching lines @@
   }
 
   void reportWarning(Node node, var message) {
     warnings.add(new WarningMessage(node, message.message));
   }
 
   void reportError(Node node, var message) {
     errors.add(new WarningMessage(node, message.message));
   }
 
+  void reportDiagnostic(SourceSpan span, String message, bool fatal) {
+    print(message);
+  }
+
   void clearWarnings() {
     warnings = [];
   }
 
   void clearErrors() {
     errors = [];
   }
 
   TreeElementMapping resolveStatement(String text) {
     parsedTree = parseStatement(text);
@@ skipping 84 matching lines @@
   importLibrary(library, compiler.coreLibrary, compiler);
   return library;
 }
 
 class StringScript extends Script {
   final String code;
   StringScript(this.code) : super(null, null);
   String get text() => code;
   String get name() => "mock script";
 }