From 5ac9184ba6749a84f0b7e2d306190ba4006ff2c8 Mon Sep 17 00:00:00 2001
From: Doohyun Cho <158799614+doocho@users.noreply.github.com>
Date: Sat, 3 Jan 2026 19:46:42 +0900
Subject: [PATCH] perf(era-utils): replace Box<dyn Fn> with function pointer
 (#20701)

---
 crates/era-utils/src/history.rs | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/crates/era-utils/src/history.rs b/crates/era-utils/src/history.rs
index c3e58a060e..625ebb6846 100644
--- a/crates/era-utils/src/history.rs
+++ b/crates/era-utils/src/history.rs
@@ -170,18 +170,14 @@ where
     <P as NodePrimitivesProvider>::Primitives: NodePrimitives<BlockHeader = BH, BlockBody = BB>,
 {
     let reader = open(meta)?;
-    let iter =
-        reader
-            .iter()
-            .map(Box::new(decode)
-                as Box<dyn Fn(Result<BlockTuple, E2sError>) -> eyre::Result<(BH, BB)>>);
+    let iter = reader.iter().map(decode as fn(_) -> _);
     let iter = ProcessIter { iter, era: meta };
 
     process_iter(iter, writer, provider, hash_collector, block_numbers)
 }
 
 type ProcessInnerIter<R, BH, BB> =
-    Map<BlockTupleIterator<R>, Box<dyn Fn(Result<BlockTuple, E2sError>) -> eyre::Result<(BH, BB)>>>;
+    Map<BlockTupleIterator<R>, fn(Result<BlockTuple, E2sError>) -> eyre::Result<(BH, BB)>>;
 
 /// An iterator that wraps era file extraction. After the final item [`EraMeta::mark_as_processed`]
 /// is called to ensure proper cleanup.