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diff --git a/src/test/ui/feature-gates/feature-gate-box-expr.stderr b/src/test/ui/feature-gates/feature-gate-box-expr.stderr
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+error[E0658]: box expression syntax is experimental; you can call `Box::new` instead
+ --> $DIR/feature-gate-box-expr.rs:12:13
+ |
+LL | let x = box 'c';
+ | ^^^^^^^
+ |
+ = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
+ = help: add `#![feature(box_syntax)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.