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diff --git a/tests/ui/impl-trait/in-trait/generics-mismatch.stderr b/tests/ui/impl-trait/in-trait/generics-mismatch.stderr
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+error[E0049]: method `bar` has 1 type parameter but its trait declaration has 0 type parameters
+ --> $DIR/generics-mismatch.rs:11:12
+ |
+LL | fn bar(&self) -> impl Sized;
+ | - expected 0 type parameters
+...
+LL | fn bar<T>(&self) {}
+ | ^ found 1 type parameter
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0049`.