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Comment: Added a reference to C99.

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As noted in [undefined behavior 169| CC. Undefined Behavior#ub_169] of
Appendix J, the behavior a program is undefined
 Annex J of \[[ISO/IEC 9899-1999| AA. C References#ISO/IEC 9899-1999]\], the behavior a program is [undefined | BB. Definitions#undefined behavior] when

the pointer argument to the free or realloc function does not match a pointer earlier returned by calloc, malloc, or realloc, or the space has been deallocated by a call to free or realloc.

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