Prepare for separate setter scope.

pkg/front_end/lib/src/fasta/source/source_loader.dart

Index: pkg/front_end/lib/src/fasta/source/source_loader.dart
diff --git a/pkg/front_end/lib/src/fasta/source/source_loader.dart b/pkg/front_end/lib/src/fasta/source/source_loader.dart
index d3e8b7f9ac06440cc07dde160bbcafdbc6c6712f..9d0d367c5e63482cebd4d4a68708cbf687b59010 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.dart
@@ -200,7 +200,7 @@ class SourceLoader<L> extends Loader<L> {
     builders.forEach((Uri uri, dynamic l) {
       SourceLibraryBuilder library = l;
       Set<Builder> members = new Set<Builder>();
-      library.members.forEach((String name, Builder member) {
+      library.forEach((String name, Builder member) {
         while (member != null) {
           members.add(member);
           member = member.next;