modern computers sometimes make me happypic.twitter.com/xEvJF4iIVr
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UB only occurs if, *after* the call *succeeds* (which is dependent in libc/malloc impl) you subtract pointers with diff > PTRDIFF_MAX.
If the compiler treats any other usage without such pointer subtraction as UB, the compiler is wrong and seriously buggy.
Also if the compiler assumes success of the call in order to assume a UB difference was taken, the compiler is buggy.
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