From 18751a708a5831dffcd3b95755496efdaf7ae7a0 Mon Sep 17 00:00:00 2001
From: Jack Wrenn <jack@wrenn.fyi>
Date: Wed, 20 Jul 2022 19:57:55 +0000
Subject: safe transmute: gracefully handle const params of wrong types

ref: https://github.com/rust-lang/rust/pull/92268/files#r925244819
---
 compiler/rustc_trait_selection/src/traits/select/confirmation.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'compiler/rustc_trait_selection/src')

diff --git a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
index a609fb2b172..672c9b7b088 100644
--- a/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/confirmation.rs
@@ -288,7 +288,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 .substs
                 .const_at(i)
                 .try_eval_bool(self.tcx(), obligation.param_env)
-                .unwrap()
+                .unwrap_or(true)
         };
 
         let src_and_dst = predicate.map_bound(|p| rustc_transmute::Types {
-- 
cgit 1.4.1-3-g733a5