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Re:Ask HN: What are some examples of beautiful software? by Someone on Monday March 14, 2016 @03:32PM (#11284962)
http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1124.pdf, section 7.20.3.2 "The free function":

"The free function causes the space pointed to by ptr to be deallocated, that is, made available for further allocation. If ptr is a null pointer, no action occurs."

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