[kernel] debugging for in statement

pkg/kernel/lib/binary/ast_to_binary.dart

 // Copyright (c) 2016, 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.
 library kernel.ast_to_binary;
 
 import '../ast.dart';
 import '../import_table.dart';
 import 'tag.dart';
 import 'dart:convert';
 import 'dart:typed_data';
@@ skipping 793 matching lines @@
     writeVariableDeclarationList(node.variables);
     writeOptionalNode(node.condition);
     writeNodeList(node.updates);
     writeNode(node.body);
     _variableIndexer.popScope();
   }
 
   visitForInStatement(ForInStatement node) {
     _variableIndexer.pushScope();
     writeByte(node.isAsync ? Tag.AsyncForInStatement : Tag.ForInStatement);
+    writeOffset(node, node.fileOffset);
     writeVariableDeclaration(node.variable);
     writeNode(node.iterable);
     writeNode(node.body);
     _variableIndexer.popScope();
   }
 
   visitSwitchStatement(SwitchStatement node) {
     _switchCaseIndexer.enter(node);
     writeByte(Tag.SwitchStatement);
     writeNode(node.expression);
@@ skipping 456 matching lines @@
   void flush() {
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }