From 06a720fa7fbd8566606246b977f2052138eb150c Mon Sep 17 00:00:00 2001
From: Arik Sosman <git@arik.io>
Date: Mon, 19 Jun 2023 10:28:36 -0700
Subject: [PATCH] Define `ChannelTypeFeatures` methods for anchors logic.

Specifically, introduce a new constructor for an anchors-
supporting feature set, as well as methods that will
maintain forwards-compatible deserialization in older
versions.
---
 lightning/src/ln/features.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lightning/src/ln/features.rs b/lightning/src/ln/features.rs
index 3e3484e73..714bfaa55 100644
--- a/lightning/src/ln/features.rs
+++ b/lightning/src/ln/features.rs
@@ -594,6 +594,15 @@ impl ChannelTypeFeatures {
 		<sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
 		ret
 	}
+
+	#[cfg(any(anchors, test))]
+	/// Constructs a ChannelTypeFeatures with anchors support
+	pub(crate) fn anchors_zero_htlc_fee_and_dependencies() -> Self {
+		let mut ret = Self::empty();
+		<sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
+		<sealed::ChannelTypeContext as sealed::AnchorsZeroFeeHtlcTx>::set_required_bit(&mut ret.flags);
+		ret
+	}
 }
 
 impl ToBase32 for InvoiceFeatures {
-- 
2.39.5