From 166d3139504ebfc343414553067099ff59276d10 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Thu, 28 Oct 2021 15:39:01 +0000
Subject: [PATCH] WTF is an HRTB

---
 lightning-invoice/src/payment.rs | 14 ++++++--------
 lightning/src/routing/mod.rs     | 15 ++++++++-------
 2 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/lightning-invoice/src/payment.rs b/lightning-invoice/src/payment.rs
index fe6a25f1a..66a54d34f 100644
--- a/lightning-invoice/src/payment.rs
+++ b/lightning-invoice/src/payment.rs
@@ -131,11 +131,11 @@ use std::sync::Mutex;
 use std::time::{Duration, SystemTime};
 
 /// A utility for paying [`Invoice]`s.
-pub struct InvoicePayer<'a: 'b, 'b, P: Deref, R, S, L: Deref, E>
+pub struct InvoicePayer<P: Deref, R, S, L: Deref, E>
 where
 	P::Target: Payer,
 	R: Router,
-	S: routing::LockableScore<'a, 'b>,
+	S: for <'b> routing::LockableScore<'b>,
 	L::Target: Logger,
 	E: EventHandler,
 {
@@ -146,7 +146,6 @@ where
 	event_handler: E,
 	payment_cache: Mutex<HashMap<PaymentHash, usize>>,
 	retry_attempts: RetryAttempts,
-	phantom: std::marker::PhantomData<(&'a (), &'b ())>,
 }
 
 /// A trait defining behavior of an [`Invoice`] payer.
@@ -190,11 +189,11 @@ pub enum PaymentError {
 	Sending(PaymentSendFailure),
 }
 
-impl<'a: 'b, 'b, P: Deref, R, S, L: Deref, E> InvoicePayer<'a, 'b, P, R, S, L, E>
+impl<P: Deref, R, S, L: Deref, E> InvoicePayer<P, R, S, L, E>
 where
 	P::Target: Payer,
 	R: Router,
-	S: routing::LockableScore<'a, 'b>,
+	S: for <'b> routing::LockableScore<'b>,
 	L::Target: Logger,
 	E: EventHandler,
 {
@@ -213,7 +212,6 @@ where
 			event_handler,
 			payment_cache: Mutex::new(HashMap::new()),
 			retry_attempts,
-			phantom: std::marker::PhantomData,
 		}
 	}
 
@@ -307,11 +305,11 @@ fn has_expired(params: &RouteParameters) -> bool {
 	Invoice::is_expired_from_epoch(&SystemTime::UNIX_EPOCH, expiry_time)
 }
 
-impl<'a: 'b, 'b, P: Deref, R, S, L: Deref, E> EventHandler for InvoicePayer<'a, 'b, P, R, S, L, E>
+impl<P: Deref, R, S, L: Deref, E> EventHandler for InvoicePayer<P, R, S, L, E>
 where
 	P::Target: Payer,
 	R: Router,
-	S: routing::LockableScore<'a, 'b>,
+	S: for <'b> routing::LockableScore<'b>,
 	L::Target: Logger,
 	E: EventHandler,
 {
diff --git a/lightning/src/routing/mod.rs b/lightning/src/routing/mod.rs
index 4c5469c5f..faee78540 100644
--- a/lightning/src/routing/mod.rs
+++ b/lightning/src/routing/mod.rs
@@ -32,16 +32,17 @@ pub trait Score {
 	fn payment_path_failed(&mut self, path: &Vec<RouteHop>, short_channel_id: u64);
 }
 
-pub trait LockableScore<'a: 'b, 'b> {
-	type Locked: Score;
-
-	fn lock(&'a self) -> Self::Locked;
+///
+pub trait LockableScore<'b> {
+	///
+	type Locked: Score + 'b;
+	///
+	fn lock(&'b self) -> Self::Locked;
 }
 
-impl<'a: 'b, 'b, S: 'b + Score, T: Deref<Target=Mutex<S>>> LockableScore<'a, 'b> for T {
+impl<'b, S: Score + 'b, T: Deref<Target=Mutex<S>>> LockableScore<'b> for T {
 	type Locked = MutexGuard<'b, S>;
-
-	fn lock(&'a self) -> Self::Locked {
+	fn lock(&'b self) -> MutexGuard<'b, S> {
 		self.deref().lock().unwrap()
 	}
 }
-- 
2.39.5