From 87ea0d76fe1ae997a11fbc914daf33644d5c65bf Mon Sep 17 00:00:00 2001
From: long-long-float <niinikazuki@yahoo.co.jp>
Date: Wed, 13 Dec 2023 01:43:10 +0900
Subject: [PATCH] Suppress suggestions in derive macro

---
 compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index 5395ffda1d1..aeab3629ece 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -2698,6 +2698,11 @@ pub(crate) fn suggest_cast(
             return false;
         }
 
+        if expr.span.in_derive_expansion() {
+            // Ignore if span is from derive macro.
+            return false;
+        }
+
         let Ok(src) = self.tcx.sess.source_map().span_to_snippet(expr.span) else {
             return false;
         };