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Erlang/OTP 20 ...
Eshell V9.3.3.9 (abort with ^G)
1> l(my_nif).
LOAD priv_data is 0x00007fd5d00c8cb0 0x00007fd5a8042570
{module,my_nif}
2> l(my_nif).
UPGRADE priv_data is 0x00007fd5d00ead70 0x00007fd5a8042570
{module,my_nif}
3> l(my_nif).
UNLOAD priv_data is 0x00007fd5a8042570
UPGRADE priv_data is 0x00007fd5d00c8cb0 0x00007fd5a8042570
{module,my_nif}
4> l(my_nif).
UNLOAD priv_data is 0x00007fd5a8042570
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upgrade is called when the NIF library is loaded and there is old code of this module with a loaded NIF library.
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