Method nextOrFail

src/main/java/org/sfj/JSONOne.java:611–617

(TokenType target)

    }

    public Token nextOrFail(TokenType target) throws ParseException {
      Token tok = nextToken();
      if (tok.type.equals(target)) {
        return tok;
      }
      throw error(line, "mismatch type; looking for " + target);
    }

    void pushback(Token t) {
      pushBack.addFirst(t);