Embedding Code in Yacc

I'm writing a yacc file as part of a compiler. I have the following error:

lang_grammar.y:143.54-55: $2 of `ClassDeclaration' has no declared type
lang_grammar.y:143.69-70: $4 of `ClassDeclaration' has no declared type
lang_grammar.y:143.84-85: $6 of `ClassDeclaration' has开发者_StackOverflow社区 no declared type

occurring on this line in my .y file:

CLASS { /* code will be embedded here */ } ID EXTENDS ID '{' ClassBody '}'
    { $$.classDeclaration = new ClassDeclaration($2.identifier, $4.identifier, $6.classBody); }

When I remove the inner embedded code:

CLASS ID EXTENDS ID '{' ClassBody '}'
    { $$.classDeclaration = new ClassDeclaration($2.identifier, $4.identifier, $6.classBody); }

It works just fine.

Are there limitations to embedding code within yacc? I was under the impression that this was possible.

Thanks.

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I think you have used wrong indexes. In previous way, embedded codes are also indexed, say

CLASS { /* code will be embedded here */ } ID EXTENDS ID '{' ClassBody '}'
$1    $2                                   $3 $4      $5 $6  $7        $8

So the action codes should be

{ $$.classDeclaration = new ClassDeclaration($3.identifier, $5.identifier, $7.classBody); }