Print the location of duplicated elements.

dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart

+// Copyright (c) 2013, 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';
+import 'memory_source_file_helper.dart';
+
+import '../../../sdk/lib/_internal/compiler/compiler.dart'
+       show Diagnostic;
+
+import 'dart:json';
+
+main() {
+  Uri script = currentDirectory.resolve(nativeToUriPath(new Options().script));
+  Uri libraryRoot = script.resolve('../../../sdk/');
+  Uri packageRoot = script.resolve('./packages/');
+
+  MemorySourceFileProvider.MEMORY_SOURCE_FILES = MEMORY_SOURCE_FILES;
+  var provider = new MemorySourceFileProvider();
+  var diagnostics = [];
+  void diagnosticHandler(Uri uri, int begin, int end,
+                         String message, Diagnostic kind) {
+    if (kind == Diagnostic.VERBOSE_INFO) {
+      return;
+    }
+    diagnostics.add('$uri:$begin:$end:$message:$kind');
+  }
+
+  Compiler compiler = new Compiler(provider.readStringFromUri,
+                                   (name, extension) => null,
+                                   diagnosticHandler,
+                                   libraryRoot,
+                                   packageRoot,
+                                   ['--analyze-only']);
+  compiler.run(Uri.parse('memory:main.dart'));
+  diagnostics.sort();
+  var expected = [
+      'memory:exporter.dart:43:47:Info: "function(hest)" is defined here.:info',
+      'memory:library.dart:14:19:Info: "class(Fisk)" is (re)exported by '
+      'multiple libraries.:info',
+      'memory:library.dart:30:34:Info: "function(fisk)" is (re)exported by '
+      'multiple libraries.:info',
+      'memory:library.dart:41:45:Info: "function(hest)" is defined here.'
+      ':info',
+      'memory:main.dart:0:22:Info: "class(Fisk)" is imported here.:info',
+      'memory:main.dart:0:22:Info: "function(fisk)" is imported here.:info',
+      'memory:main.dart:0:22:Info: "function(hest)" is imported here.:info',
+      'memory:main.dart:23:46:Info: "class(Fisk)" is imported here.:info',
+      'memory:main.dart:23:46:Info: "function(fisk)" is imported here.:info',
+      'memory:main.dart:23:46:Info: "function(hest)" is imported here.:info',
+      'memory:main.dart:59:63:Warning: duplicate import of Fisk:warning',
+      'memory:main.dart:76:80:duplicate import of fisk:error',
+      'memory:main.dart:86:90:duplicate import of hest:error'
+  ];
+  Expect.listEquals(expected, diagnostics);
+  Expect.isTrue(compiler.compilationFailed);
+}
+
+const Map MEMORY_SOURCE_FILES = const {
+  'main.dart': """
+import 'library.dart';
+import 'exporter.dart';
+
+main() {
+  Fisk x = null;
+  fisk();
+  hest();
+}
+""",
+  'library.dart': """
+library lib;
+
+class Fisk {
+}
+
+fisk() {}
+
+hest() {}
+""",
+  'exporter.dart': """
+library exporter;
+
+export 'library.dart';
+
+hest() {}
+""",
+};