dart:io | Tiny change to Link.exists().

sdk/lib/io/file_system_entity.dart

Index: sdk/lib/io/file_system_entity.dart
diff --git a/sdk/lib/io/file_system_entity.dart b/sdk/lib/io/file_system_entity.dart
index 907d25a3823548ce0f0649cc37f26fa8037af0c0..847b7d12839eff0abbccca09027dbc5b8c2cf3a5 100644
--- a/sdk/lib/io/file_system_entity.dart
+++ b/sdk/lib/io/file_system_entity.dart
@@ -53,7 +53,7 @@ abstract class FileSystemEntity {
     return service.call(request).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(response,
-                                     "Error getting type of '$_path'");
+                                     "Error getting type of '$path'");
       }
       return response;
     });