From d7c4e94cbed8cf7821658437225f0768a0e4ff4c Mon Sep 17 00:00:00 2001
From: Mira Ressel <mira@parity.io>
Date: Mon, 19 Jun 2023 16:43:15 +0200
Subject: [PATCH] chore: ignore the new let_with_type_underscore lint

---
 frame/benchmarking/src/v1.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/frame/benchmarking/src/v1.rs b/frame/benchmarking/src/v1.rs
index be6dc393cbce3..9b5942c2c7022 100644
--- a/frame/benchmarking/src/v1.rs
+++ b/frame/benchmarking/src/v1.rs
@@ -757,6 +757,7 @@ macro_rules! benchmark_backend {
 		}
 	};
 	// mutation arm to look after `let _ =`
+	// the `: _` syntax is used below as a workaround to avoid an infinite macro expansion loop in clippy
 	(
 		{ $( $instance:ident: $instance_bound:tt )? }
 		$name:ident
@@ -776,6 +777,7 @@ macro_rules! benchmark_backend {
 			{ $( $parsed )* }
 			{ $eval }
 			{
+				#[allow(clippy::let_with_type_underscore)]
 				let $pre_id : _ = $pre_ex;
 				$( $rest )*
 			}