Re: $$ for the midrule at... has no declared type

[Akim Demaille]

Le 18 mars 09 à 02:22, Rodrigo Dominguez a écrit :

> $ bison -d -o c-parse.c c-parse.y
>
> c-parse.y:1743.19-20: $$ for the midrule at $4 of `structsp_attr'  
> has no
> declared type
> c-parse.y:1753.19-20: $$ for the midrule at $4 of `structsp_attr'  
> has no
> declared


Bison has no means to guess what is the type of $$ in mid-rule  
actions, you have to tell it using $<type-tag>$.  In the following  
rule, you should should change $$ into $<ttype>$ (since that's how it  
is used in the action of the whole rule).

structsp_attr:
          struct_head identifier '{'
                { $$ = start_struct (RECORD_TYPE, $2);
                  /* Start scope of tag before parsing components.  */
                }
          component_decl_list '}' maybe_attribute
                { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }


Bugs in previous versions of Bison prevented these errors from being  
reported.