From a29eca5d82d36bdbda5cccf317b9c0b3e33ed23d Mon Sep 17 00:00:00 2001
From: varkor <github@varkor.com>
Date: Tue, 23 Apr 2019 00:03:00 +0100
Subject: [PATCH] Fix issue with const params in operand.rs

---
 src/librustc_mir/interpret/operand.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/librustc_mir/interpret/operand.rs b/src/librustc_mir/interpret/operand.rs
index df6d4568ab3..ed7c316e3da 100644
--- a/src/librustc_mir/interpret/operand.rs
+++ b/src/librustc_mir/interpret/operand.rs
@@ -524,7 +524,8 @@ impl<'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>> InterpretCx<'a, 'mir, 'tcx, M>
         layout: Option<TyLayout<'tcx>>,
     ) -> EvalResult<'tcx, OpTy<'tcx, M::PointerTag>> {
         let op = match val.val {
-            ConstValue::Param(_) | ConstValue::Infer(_) | ConstValue::Placeholder(_) => bug!(),
+            ConstValue::Param(_) => return err!(TooGeneric),
+            ConstValue::Infer(_) | ConstValue::Placeholder(_) => bug!(),
             ConstValue::ByRef(ptr, alloc) => {
                 // We rely on mutability being set correctly in that allocation to prevent writes
                 // where none should happen -- and for `static mut`, we copy on demand anyway.