Hello,

as a "me too" mail, I noted that bison core dumped with this yacc file:

<--->
%{
%}

%token  <val> NUMBER
%token  <str> WORD
%type   <str>   rule
%type   <val>   signed_number

%%

rule:
        WORD            = { $$ = $1; } |
        /* empty */     = { $$ = NULL; };

signed_number:
        NUMBER          = { $$ = $1; } |
        '-' NUMBER      = { $$ = -$2; };

%%
<--->

bison failed only for a command line with the -d option like:

bison -y -d <file>.y

The segmentation fault occured in a malloc, with a desired size of 8 in
my case.

Hope this helps.

Benoit

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