bisonc++ - bisonc++ - プロダクション ルールはありませんか?

Question

私はbisonc ++で以下をコンパイルしようとしています:

%baseclass-preinclude <iostream>
%lsp-needed

%token NUMBER COMMENT KEYWORD VARIABLE LOGICAND LOGICOR LOGICEQUALS DOUBLELESSER
%token DOUBLEGREATER MOD LESSER GREATER OPEN CLOSE NEGATE CURLYOPEN CURLYCLOSE SEMICOLON

%left EQUALS
%left PLUS MINUS
%left TIMES
%left DIVISION

%%

start:
    expressions
    {
        std::cout << "start -> expressions" << std::endl;
    }
;

expressions:
    // empty
    {
        std::cout << "expressions -> epsylon" << std::endl;
    }
|
    exp expressions
    {
        std::cout << "expressions -> exp expressions" << std::endl;
    }
;

exp:
    NUMBER
    {
        std::cout << "exp -> NUMBER" << std::endl;
    }
|
    COMMENT
    {
        std::cout << "exp -> COMMENT" << std::endl;
    }
|
    exp LOGICAND exp
    {
        std::cout << "exp -> exp LOGICAND exp" << std::endl;
    }
|
    exp LOGICOR exp
    {
        std::cout << "exp -> exp LOGICOR exp" << std::endl;
    }
|
    exp LOGICEQUALS exp
    {
        std::cout << "exp -> exp LOGICEQUALS exp" << std::endl;
    }
|
    exp DOUBLELESSER exp
    {
        std::cout << "exp -> exp DOUBLELESSER exp" << std::endl;
    }
|    
    exp DOUBLEGREATER exp
    {
        std::cout << "exp -> exp DOUBLEGREATER exp" << std::endl;
    }
|
    exp PLUS exp
    {
        std::cout << "exp -> exp PLUS exp" << std::endl;
    }
|
    exp MINUS exp
    {
        std::cout << "exp -> exp MINUS exp" << std::endl;
    }
|
    exp TIMES exp
    {
        std::cout << "exp -> exp EQUAL exp" << std::endl;
    }
|
    exp EQUAL exp
    {
        std::cout << "exp -> exp EQUAL exp" << std::endl;
    }
|
    exp DIVISION exp
    {
        std::cout << "exp -> exp DIVISION exp" << std::endl;
    }
|
    exp MOD exp
    {
        std::cout << "exp -> exp MOD exp" << std::endl;
    }
|
    exp LESSER exp
    {
        std::cout << "exp -> exp LESSER exp" << std::endl;
    }
|    
    exp GREATER exp
    {
        std::cout << "exp -> exp GREATER exp" << std::endl;
    }
|
    OPEN exp CLOSE
    {
        std::cout << "exp -> OPEN exp CLOSE" << std::endl;
    }
|
    NEGATE exp
    {
        std::cout << "exp -> NEGATE exp" << std::endl;
    }
|
    CURLYOPEN exp CURLYCLOSE
    {
        std::cout << "exp -> CURLYOPEN exp CURLYCLOSE" << std::endl;
    }
|
    exp SEMICOLON
    {
        std::cout << "exp -> SEMICOLON" << std::endl;
    }
|
    KEYWORD VARIABLE SEMICOLON
    {
        std::cout << "exp -> KEYWORD VARIABLE SEMICOLON" << std::endl;
    }
;

ただし、エラーが返され続けます

') encountered.1] Line 1: unrecognized input (`
': identifier or character-constant expected.
[bead.y: fatal] Line 23: No production rules
134950080

私には明らかにいくつかの生産ルールがあり、何が間違っているのかわかりません。私は別の実用的な例からほとんどのコードをコピーし、好みに合わせて変更しました。なにが問題ですか？