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Did you use gcc or clang or...?

When I ran this locally I get:

    0x7ffeee2a4808 0x7ffeee2a4810 0
    0x7ffeee2a4808 0x7ffeee2a4810 0
With -O0 I get 1/1 instead of 0/0 so this appears to be a compiler optimization.


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