From 7f318256c908be1df494ae16c2d2dad94e9f66a7 Mon Sep 17 00:00:00 2001
From: klensy <klensy@users.noreply.github.com>
Date: Thu, 12 May 2022 19:26:52 +0300
Subject: [PATCH] fix clippy expect_fun_call

---
 compiler/rustc_const_eval/src/const_eval/valtrees.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_const_eval/src/const_eval/valtrees.rs b/compiler/rustc_const_eval/src/const_eval/valtrees.rs
index 374179d0cc24d..f57f25c19f90f 100644
--- a/compiler/rustc_const_eval/src/const_eval/valtrees.rs
+++ b/compiler/rustc_const_eval/src/const_eval/valtrees.rs
@@ -58,7 +58,9 @@ fn slice_branches<'tcx>(
     ecx: &CompileTimeEvalContext<'tcx, 'tcx>,
     place: &MPlaceTy<'tcx>,
 ) -> Option<ty::ValTree<'tcx>> {
-    let n = place.len(&ecx.tcx.tcx).expect(&format!("expected to use len of place {:?}", place));
+    let n = place
+        .len(&ecx.tcx.tcx)
+        .unwrap_or_else(|_| panic!("expected to use len of place {:?}", place));
     let branches = (0..n).map(|i| {
         let place_elem = ecx.mplace_index(place, i).unwrap();
         const_to_valtree_inner(ecx, &place_elem)