From b4dcb56013f3b60cff4bcc4a24c4948fba9366d3 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Thu, 28 Oct 2021 17:51:29 +0000
Subject: [PATCH] f add reasoning for wrapper

---
 lightning/src/ln/peer_handler.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lightning/src/ln/peer_handler.rs b/lightning/src/ln/peer_handler.rs
index 2095f0519..9a1b04853 100644
--- a/lightning/src/ln/peer_handler.rs
+++ b/lightning/src/ln/peer_handler.rs
@@ -493,6 +493,10 @@ impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor,
 	}
 }
 
+/// A simple wrapper that optionally prints " from <pubkey>" for an optional pubkey.
+/// This works around `format!()` taking a reference to each argument, preventing
+/// `if let Some(node_id) = peer.their_node_id { format!(.., node_id) } else { .. }` from compiling
+/// due to lifetime errors.
 struct OptionalFromDebugger<'a>(&'a Option<PublicKey>);
 impl core::fmt::Display for OptionalFromDebugger<'_> {
 	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
-- 
2.39.5