Reads a short form of tokens
@param {Number} token - The ending token
@return {Block}
function(token) {
    const body = this.node("block");
    const items = [];
    if (this.expect(":")) this.next();
    while (this.token != this.EOF && this.token !== token) {
      items.push(this.read_inner_statement());
    }
    if (this.expect(token)) this.next();
    this.expectEndOfStatement();
    return body(null, items);
  }