Depending on the kind of warning, you may be able to re-write the code in question including a 'todo!()' to capture the "i need to think about this" case.
This way you get a crash at runtime. This is preferable to continuing execution with incorrect computation.
It's best just to fix the warnings ASAP. They are usually trivial anyway.
Yeah, and meanwhile visa are doing god knows how many million transactions per second.