code: function (src) {
      if (isConstant(src)) {
        return this.buffer(toConstant(src) + '')
      }
      var body = this.parseExpr(src);
      var ast = this.ast_buffer(body);
      return ast;
    }
docs: Buffer the given `src` so it is evaluated at run time
  
  @param {String} src
  @api public