From c6454dd582c66a53bbf91947098af59689f61c1e Mon Sep 17 00:00:00 2001
From: Maybe Lapkin <waffle.lapkin@gmail.com>
Date: Fri, 29 Nov 2024 20:27:24 +0100
Subject: [PATCH] don't polymorphize without a reason to

---
 compiler/rustc_mir_build/src/check_tail_calls.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/compiler/rustc_mir_build/src/check_tail_calls.rs b/compiler/rustc_mir_build/src/check_tail_calls.rs
index e6a25634e29..6eade204970 100644
--- a/compiler/rustc_mir_build/src/check_tail_calls.rs
+++ b/compiler/rustc_mir_build/src/check_tail_calls.rs
@@ -153,8 +153,7 @@ impl<'tcx> TailCallCkVisitor<'_, 'tcx> {
     fn needs_location(&self, ty: Ty<'tcx>) -> bool {
         if let &ty::FnDef(did, substs) = ty.kind() {
             let instance =
-                ty::Instance::expect_resolve(self.tcx, self.typing_env, did, substs, DUMMY_SP)
-                    .polymorphize(self.tcx);
+                ty::Instance::expect_resolve(self.tcx, self.typing_env, did, substs, DUMMY_SP);
 
             instance.def.requires_caller_location(self.tcx)
         } else {