1 files changed, 2 insertions, 1 deletions
diff --git a/src/test/ui/consts/const-eval/union-const-eval-field.rs b/src/test/ui/consts/const-eval/union-const-eval-field.rs
index c0bfbc17629..2bdad3af889 100644
--- a/src/test/ui/consts/const-eval/union-const-eval-field.rs
+++ b/src/test/ui/consts/const-eval/union-const-eval-field.rs
@@ -34,7 +34,8 @@ const fn read_field2() -> Field2 {
 }
 
 const fn read_field3() -> Field3 {
-    const FIELD3: Field3 = unsafe { UNION.field3 }; //~ ERROR any use of this value
+    const FIELD3: Field3 = unsafe { UNION.field3 };
+    //~^ ERROR it is undefined behavior to use this value
     FIELD3
 }