Re: %destructor and unused values

[John P. Hartmann]

:-)  Well done.

Those comments weren't there ten years ago.

On 28 January 2013 18:17, Akim Demaille <address@hidden> wrote:
>
> Le 28 janv. 2013 à 18:14, "John P. Hartmann" <address@hidden> a écrit :
>
>> Thank you for the clarification.  I see.
>>
>> I guess I am handicapped by having converted the parser code to /360
>> assembler language.
>
> You are one of a kind :)
>
>> Others might have studied the skeleton code.  Maybe a comment to the
>> effect that one should forget having seen this assignment?
>
> Well, currently C++ reads:
>
>     /* If YYLEN is nonzero, implement the default value of the action:
>        `$$ = $1'.  Otherwise, use the top of the stack.
>
>        Otherwise, the following line sets YYLHS.VALUE to garbage.
>        This behavior is undocumented and Bison
>        users should not rely upon it.  */
>
> and c reads:
>
>   /* If YYLEN is nonzero, implement the default value of the action:
>      `$$ = $1'.
>
>      Otherwise, the following line sets YYVAL to garbage.
>      This behavior is undocumented and Bison
>      users should not rely upon it.  Assigning to YYVAL
>      unconditionally makes the parser a bit smaller, and it avoids a
>      GCC warning that YYVAL may be used uninitialized.  */
>
> but I guess it doesn't show in /360 assembler :)