Report malformed URIs in library dependencies

pkg/compiler/lib/src/warnings.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.
 
 part of dart2js;
 
 const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 1542 matching lines @@
       howToFix: "Is '#{name}' spelled right?",
       examples: const [
           """
 // 'addAll' is misspelled.
 @MirrorsUsed(targets: 'dart.core.List.addAl')
 import 'dart:mirrors';
 
 main() {}
 """]);
 
+  static const MessageKind INVALID_URI = const MessageKind(
+      "'#{uri}' is not a valid URI.",
+      howToFix: DONT_KNOW_HOW_TO_FIX,
+      examples: const [
+        """
+// can't have a '[' in a URI
+import '../../Udyn[mic ils/expect.dart';
+
+main() {}
+"""]);
+
   static const MessageKind READ_SCRIPT_ERROR = const MessageKind(
       "Can't read '#{uri}' (#{exception}).",
       // Don't know how to fix since the underlying error is unknown.
       howToFix: DONT_KNOW_HOW_TO_FIX,
       examples: const [
           """
 // 'foo.dart' does not exist.
 import 'foo.dart';
 
 main() {}
@@ skipping 972 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }