From: Matt Corallo <git@bluematt.me>
Date: Thu, 28 Oct 2021 17:51:29 +0000 (+0000)
Subject: f add reasoning for wrapper
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=refs%2Fheads%2F2021-10-1137-old-push;p=rust-lightning

f add reasoning for wrapper
---

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> {