Fixes.

sdk/lib/io/data_transformer.dart

Index: sdk/lib/io/data_transformer.dart
diff --git a/sdk/lib/io/data_transformer.dart b/sdk/lib/io/data_transformer.dart
index 69c9fd6d580218805c8e3b14bc3e322595e05fe7..4a4001d3c26aa2d6e8b6888e521ab14682ada4bd 100644
--- a/sdk/lib/io/data_transformer.dart
+++ b/sdk/lib/io/data_transformer.dart
@@ -51,7 +51,8 @@ class _FilterTransformer extends StreamEventTransformer<List<int>, List<int>> {
       }
     } catch (e, s) {
       _closed = true;
-      sink.addError(e, s);
+      // TODO(floitsch): we are losing the stack trace.
+      sink.addError(e);
       sink.close();
     }
   }
@@ -65,7 +66,8 @@ class _FilterTransformer extends StreamEventTransformer<List<int>, List<int>> {
         sink.add(out);
       }
     } catch (e, s) {
-      sink.addError(e, s);
+      // TODO(floitsch): we are losing the stack trace.
+      sink.addError(e);
       _closed = true;
     }
     if (!_closed) _filter.end();