def begin_pos
      node_begin_pos = @node.loc.expression.begin_pos
      while @node.loc.expression.source_buffer.source[node_begin_pos -= 1] == ' '
      end
      node_begin_pos - Engine::ERUBY_STMT_SPLITTER.length + 1
    end
def begin_pos
      node_begin_pos = @node.loc.expression.begin_pos
      while @node.loc.expression.source_buffer.source[node_begin_pos -= 1] == ' '
      end
      node_begin_pos - Engine::ERUBY_STMT_SPLITTER.length + 1
    end
Begin position of code to replace.

 @return [Integer] begin position.