Function bitcoin::consensus::verify_transaction_with_flags

pub fn verify_transaction_with_flags<S, F>(
    tx: &Transaction,
    spent: S,
    flags: F
) -> Result<(), TxVerifyError>where
    S: FnMut(&OutPoint) -> Option<TxOut>,
    F: Into<u32>,

Verifies that this transaction is able to spend its inputs.

The spent closure should not return the same TxOut twice!