Step next should respect do/while condition block.

src/parser.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2524 matching lines @@
   // DoStatement ::
   //   'do' Statement 'while' '(' Expression ')' ';'
 
   DoWhileStatement* loop = NEW(DoWhileStatement(labels));
   Target target(this, loop);
 
   Expect(Token::DO, CHECK_OK);
   Statement* body = ParseStatement(NULL, CHECK_OK);
   Expect(Token::WHILE, CHECK_OK);
   Expect(Token::LPAREN, CHECK_OK);
+
+  if (loop != NULL) {
+    int position = scanner().location().beg_pos;
+    loop->set_condition_position(position);
+  }
+
   Expression* cond = ParseExpression(true, CHECK_OK);
   Expect(Token::RPAREN, CHECK_OK);
 
   // Allow do-statements to be terminated with and without
   // semi-colons. This allows code such as 'do;while(0)return' to
   // parse, which would not be the case if we had used the
   // ExpectSemicolon() functionality here.
   if (peek() == Token::SEMICOLON) Consume(Token::SEMICOLON);
 
   if (loop != NULL) loop->Initialize(cond, body);
@@ skipping 2226 matching lines @@
                        start_position,
                        is_expression);
   return result;
 }
 
 
 #undef NEW
 
 
 } }  // namespace v8::internal