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diff --git a/src/test/ui/box/alloc-unstable-fail.stderr b/src/test/ui/box/alloc-unstable-fail.stderr
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+++ b/src/test/ui/box/alloc-unstable-fail.stderr
@@ -0,0 +1,12 @@
+error[E0658]: use of unstable library feature 'allocator_api'
+ --> $DIR/alloc-unstable-fail.rs:4:26
+ |
+LL | let _boxed: Box<u32, _> = Box::new(10);
+ | ^
+ |
+ = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
+ = help: add `#![feature(allocator_api)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.