fixup! Add a sample module FilesystemPersister.

Author: valentinewallace

lightning-persister/src/lib.rs

@@ -152,8 +152,10 @@ mod tests {
 	extern crate bitcoin;
 	use crate::FilesystemPersister;
 	use bitcoin::blockdata::block::{Block, BlockHeader};
+	use bitcoin::Txid;
 	use DiskWriteable;
 	use Error;
+	use lightning::chain::transaction::OutPoint;
 	use lightning::{check_closed_broadcast, check_added_monitors};
 	use lightning::ln::features::InitFeatures;
 	use lightning::ln::functional_test_utils::*;
@@ -163,18 +165,16 @@ mod tests {
 	use lightning::util::ser::Writer;
 	use lightning::util::test_utils;
 	use std::fs;
+	use std::io;
 	#[cfg(not(target_os = "windows"))]
 	use {
 		bitcoin::hashes::hex::FromHex,
 		bitcoin::hashes::sha256::Hash as Sha256,
 		bitcoin::hashes::Hash,
-		bitcoin::Txid,
 		lightning::{unwrap_send_err, get_payment_preimage_hash},
-		lightning::chain::transaction::OutPoint,
 		lightning::ln::channelmanager::{PaymentSendFailure, PaymentPreimage, PaymentHash},
 		lightning::routing::router::get_route,
 		lightning::util::errors::APIError,
-		std::io,
 	};
 	#[cfg(target_os = "windows")]
 	use {