I have tried to put bitwise-and(&) into the display filter Dialog box's sources, made proper and necessary changes that are required (like calling the bitwise-and related function (ftype_can_bitwise_and) from ftypes/ftypes.c same as the other operator functions are called). There are no compile-time errors but at the end I'm facing a linker error called :
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As I can't find the symbol
If this is the case you will also need to add it to the list of exported functions in epan\libwireshark.def so that code outside of libwireshark can use it.