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diff --git a/src/test/ui/feature-gates/feature-gate-trait-alias.stderr b/src/test/ui/feature-gates/feature-gate-trait-alias.stderr
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index 000000000..41cd6dbd8
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+++ b/src/test/ui/feature-gates/feature-gate-trait-alias.stderr
@@ -0,0 +1,12 @@
+error[E0658]: trait aliases are experimental
+ --> $DIR/feature-gate-trait-alias.rs:1:1
+ |
+LL | trait Foo = Default;
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: see issue #41517 <https://github.com/rust-lang/rust/issues/41517> for more information
+ = help: add `#![feature(trait_alias)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.