code: function (index, blocks, out) {
          var node = new Node("log"), block = blocks[index];
          node.line = block.line;
          node.column = block.column;
          node.exprs = block.exprs;
          out.push(node);
          return index;
      }
docs: Manages a log statement.
  @param {Array} blocks the full list of blocks.
  @param {Integer} index the index of the block to manage.
  @param {Array} out the output as an array of Node.
  @return {Integer} the index of the block where the function stopped or -1 if all blocks have been handled.