Function fuzz_calldata_from_state 

pub fn fuzz_calldata_from_state<S>(
    func: Function,
    state: &S,
) -> impl Strategy<Value = Bytes> + use<S>
where
    S: FuzzStateReader,

Given a function and some state, it returns a strategy which generated valid calldata for the given function’s input types, based on state taken from the EVM.