From 156561267ea9625d9d8344cf0a7755aff96431a4 Mon Sep 17 00:00:00 2001
From: Santiago Pastorino <spastorino@gmail.com>
Date: Thu, 19 Dec 2019 14:14:36 -0300
Subject: [PATCH] Add span_bug that notes that shuffle indices must be constant

---
 src/librustc_codegen_ssa/mir/block.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/librustc_codegen_ssa/mir/block.rs b/src/librustc_codegen_ssa/mir/block.rs
index fa79541701e4..9169010da880 100644
--- a/src/librustc_codegen_ssa/mir/block.rs
+++ b/src/librustc_codegen_ssa/mir/block.rs
@@ -618,6 +618,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                                 c,
                             );
                             return OperandRef { val: Immediate(llval), layout: bx.layout_of(ty) };
+                        } else {
+                            span_bug!(span, "shuffle indices must be constant");
                         }
                     }