From f55ff4103f4e75309954cfe93ea0994646430fbb Mon Sep 17 00:00:00 2001
From: lcnr <rust@lcnr.de>
Date: Sat, 23 Oct 2021 21:05:03 +0200
Subject: [PATCH] don't inline `report_overlap_conflict`

---
 compiler/rustc_trait_selection/src/traits/specialize/mod.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
index 96ab399424e2..b64c55592272 100644
--- a/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/specialize/mod.rs
@@ -291,6 +291,11 @@ pub(super) fn specialization_graph_provider(
     sg
 }
 
+// This function is only used when
+// encountering errors and inlining
+// it negatively impacts perf.
+#[cold]
+#[inline(never)]
 fn report_overlap_conflict(
     tcx: TyCtxt<'_>,
     overlap: OverlapError,