In Section 7.8.3 we suggested that it was possible to garbage collect for C programs that do not fabricate expressions that point to a place within a chunk unless there is an address that points...

In Section 7.8.3 we suggested that it was possible to garbage collect for C programs that do not fabricate expressions that point to a place within a chunk unless there is an address that points somewhere within that same chunk. Thus, we rule out code like

p = 12345;


x = *p;


because, while p might point to some chunk accidentally, there could be no other pointer to that chunk. On the other hand, with the code above, it is more likely that p points nowhere, and executing that code will result in a segmentation fault. However, in C it is possible to write code such that a variable like p is guaranteed to point to some chunk, and yet there is no pointer to that chunk. Write such a program.