fix a list infinite loop bug #218
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imagine such code: list_t ls1 = alloc_object(1); cons(2, ls1); these code will make an infinite loop, because NEXT(NEXT(ls1) ) == ls. to avoid this bug, fix the alloc_object() function, add some statements.
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imagine such code:
list_t ls1 = alloc_object(1);
cons(2, ls1);
these code will make an infinite loop, because when alloc an object,
didn't modify its next, so it naturally links with object allocated later.
In this case, 2 will be next of 1, but when cons 2 and 1, 2 becomes prev of 1.
to avoid this bug, fix alloc_object() function's bug by adding some statements.