static fromExpression(expr) {
    var args = new Arguments
      , len = expr.nodes.length;
    args.lineno = expr.lineno;
    args.column = expr.column;
    args.isList = expr.isList;
    for (var i = 0; i < len; ++i) {
      args.push(expr.nodes[i]);
    }
    return args;
  }
Initialize an `Arguments` object with the nodes
from the given `expr`.

@param {Expression} expr
@return {Arguments}
@api public