2 files changed, 16 insertions, 1 deletions
diff --git a/src/test/ui/consts/promote-not.rs b/src/test/ui/consts/promote-not.rs
index 8daac758377..30bb9917bf7 100644
--- a/src/test/ui/consts/promote-not.rs
+++ b/src/test/ui/consts/promote-not.rs
@@ -27,4 +27,9 @@ pub const fn promote_union() {
     let _x: &'static i32 = &unsafe { U { x: 0 }.x }; //~ ERROR temporary value dropped while borrowed
 }
 
+// We do not promote union field accesses in `const`, either.
+const TEST_UNION: () = {
+    let _x: &'static i32 = &unsafe { U { x: 0 }.x }; //~ ERROR temporary value dropped while borrowed
+};
+
 fn main() {}
diff --git a/src/test/ui/consts/promote-not.stderr b/src/test/ui/consts/promote-not.stderr
index efe921b6011..6ca7a4c273e 100644
--- a/src/test/ui/consts/promote-not.stderr
+++ b/src/test/ui/consts/promote-not.stderr
@@ -38,6 +38,16 @@ LL |     let _x: &'static i32 = &unsafe { U { x: 0 }.x };
 LL | }
    | - temporary value is freed at the end of this statement
 
-error: aborting due to 4 previous errors
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/promote-not.rs:32:29
+   |
+LL |     let _x: &'static i32 = &unsafe { U { x: 0 }.x };
+   |             ------------    ^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
+   |             |
+   |             type annotation requires that borrow lasts for `'static`
+LL | };
+   | - temporary value is freed at the end of this statement
+
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0716`.