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typedef struct x
{
struct x *type;
struct x *chain;
struct x *value;
} *tree;
int
func (new, old)
register tree new, old;
{
if (old->type == 0 || new->type == 0)
{
register tree t = old->type;
if (t == 0)
t = new->type;
for (; t; t = t->chain )
if (t->value)
return 1;
}
return 0;
}
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