_if:
    IF
    nesting
    {
        symtab_push();
    }
;

_else:
    ELSE
    statement
    {
        $$ = $2;
    }
|
    zeroframe
;

if_stat:
    _if
    openpar
    condition
    closepar
    statement
    popdead
    pushdead
    _else
    popdead
    {
        $$ = *p_if(&$3, &$5, &$8);
        symtab_pop();
    }
;







