From ce00ae2dc7bfaa1f92473cec94cefc930f6a4fd0 Mon Sep 17 00:00:00 2001
From: dapplion <35266934+dapplion@users.noreply.github.com>
Date: Thu, 30 Apr 2026 00:08:35 +0200
Subject: [PATCH] Use stable `if matches!` instead of `if let` match guard

`if let` guards are nightly-only (rust-lang/rust#51114), causing
`error[E0658]` and a CI `check-code` failure. Replace with the stable
`if matches!(...)` form suggested by rustc.
---
 beacon_node/network/src/network_beacon_processor/mod.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/beacon_node/network/src/network_beacon_processor/mod.rs b/beacon_node/network/src/network_beacon_processor/mod.rs
index 7a978548a7..c1980215d1 100644
--- a/beacon_node/network/src/network_beacon_processor/mod.rs
+++ b/beacon_node/network/src/network_beacon_processor/mod.rs
@@ -983,8 +983,10 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                 );
             }
             Err(FetchEngineBlobError::BlobProcessingError(e))
-                if let BlockOrEnvelopeError::BlockError(BlockError::DuplicateFullyImported(..)) =
-                    *e =>
+                if matches!(
+                    *e,
+                    BlockOrEnvelopeError::BlockError(BlockError::DuplicateFullyImported(..))
+                ) =>
             {
                 debug!(
                     %block_root,