From d814d10069122c61d7d275fe6305382703b60448 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Tue, 2 Aug 2022 20:52:15 -0400
Subject: [PATCH] interpret: use new OpTy::len for Len rvalue

This avoids a `force_allocation`
---
 compiler/rustc_const_eval/src/interpret/step.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compiler/rustc_const_eval/src/interpret/step.rs b/compiler/rustc_const_eval/src/interpret/step.rs
index 683e11ff7e0e5..6b827149f505e 100644
--- a/compiler/rustc_const_eval/src/interpret/step.rs
+++ b/compiler/rustc_const_eval/src/interpret/step.rs
@@ -251,8 +251,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
             Len(place) => {
                 let src = self.eval_place(place)?;
-                let mplace = self.force_allocation(&src)?;
-                let len = mplace.len(self)?;
+                let op = self.place_to_op(&src)?;
+                let len = op.len(self)?;
                 self.write_scalar(Scalar::from_machine_usize(len, self), &dest)?;
             }